fix(deps): Update grpc-java monorepo to v1.68.1 (#142)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [io.grpc:protoc-gen-grpc-java](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |
| [io.grpc:grpc-testing](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |
| [io.grpc:grpc-netty-shaded](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |
| [io.grpc:grpc-stub](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |
| [io.grpc:grpc-services](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |
| [io.grpc:grpc-protobuf](https://togithub.com/grpc/grpc-java) | dependencies | patch | `1.68.0` -> `1.68.1` |

---

### Release Notes

<details>
<summary>grpc/grpc-java (io.grpc:protoc-gen-grpc-java)</summary>

### [`v1.68.1`](https://togithub.com/grpc/grpc-java/releases/tag/v1.68.1)

##### gRPC Java 1.68.1 Release Notes

v1.68.0 was a mistake. This is the first release of version 1.68.x

##### Bug Fixes

-   xds: Fix NullPointerException introduced in "Fix load reporting when pick first is used for locality-routing" ([#&#8203;11553](https://togithub.com/grpc/grpc-java/issues/11553)). This was in 1.67.1 but not 1.68.0

##### Behavior Changes

-   core: JSON parsing rejects duplicate keys in objects ([#&#8203;11575](https://togithub.com/grpc/grpc-java/issues/11575)) ([`4be69e3`](https://togithub.com/grpc/grpc-java/commit/4be69e3f8)). This is the existing behavior in C core. Duplicate keys in objects are dangerous as which value takes effect is undefined. Previously, the last value was used
-   okhttp: Detect transport executors with no remaining threads ([#&#8203;11503](https://togithub.com/grpc/grpc-java/issues/11503)) ([`3a6be9c`](https://togithub.com/grpc/grpc-java/commit/3a6be9ca1)). The transport uses two threads, but one is on-demand. If the executor provided to `builder.transportExecutor()` runs out of threads (e.g., it is a fixed-size thread pool), *all* transports can be wedged, unable to run on-demand tasks, until keepalive kills one of them. Two threads are now used when handshaking a new transport, and the transport will time out after 1 second with “Timed out waiting for second handshake thread” if two threads are unavailable
-   gcp-csm-o11y: Get  `mesh_id` value from `CSM_MESH_ID` environment variable, instead of getting it from bootstrap file ([`84d30af`](https://togithub.com/grpc/grpc-java/commit/84d30afad))

##### Improvements

-   New grpc-context-override-opentelemetry artifact ([#&#8203;11523](https://togithub.com/grpc/grpc-java/issues/11523)) ([`782a44a`](https://togithub.com/grpc/grpc-java/commit/782a44ad6)) ([#&#8203;11599](https://togithub.com/grpc/grpc-java/issues/11599)) ([`e59ae5f`](https://togithub.com/grpc/grpc-java/commit/e59ae5fad)). This is a `io.grpc.Context` storage override to store its state in `io.opentelemetry.context.Context`. Libraries should not add a dependency on this artifact, as applications can only have one storage override in their classpath
-   New grpc-s2a artifact. It is a transport that offloads the handshake similar to ALTS, but for TLS. It provides `io.grpc.s2a.S2AChannelCredentials`
-   api: Enhance name resolver \`ResolutionResult\` to hold addresses or error so the single listener API *onResult2* is used to convey both success and error cases for name resolution ([#&#8203;11330](https://togithub.com/grpc/grpc-java/issues/11330)) ([`1ded8af`](https://togithub.com/grpc/grpc-java/commit/1ded8aff8))
-   core: Handle NameResolver/LoadBalancer exceptions when panicking ([`b692b9d`](https://togithub.com/grpc/grpc-java/commit/b692b9d26)). This expands the class of bugs that will fail RPCs with the panic error, versus some undefined behavior
-   core: Use the default service config in case of initial name resolver address resolution error ([#&#8203;11577](https://togithub.com/grpc/grpc-java/issues/11577)) ([`fa26a8b`](https://togithub.com/grpc/grpc-java/commit/fa26a8bc5))
-   core: `StreamTracer.inboundMessageRead()` now reports uncompressed message size when the message does not need compression ([#&#8203;11598](https://togithub.com/grpc/grpc-java/issues/11598)) ([`2aae68e`](https://togithub.com/grpc/grpc-java/commit/2aae68e11)). Previously it always reported `-1` (unknown)
-   netty: Avoid TCP_USER_TIMEOUT warning when explicitly specifying a non-epoll channel type to use ([#&#8203;11564](https://togithub.com/grpc/grpc-java/issues/11564)) ([`62f4098`](https://togithub.com/grpc/grpc-java/commit/62f409810))
-   okhttp: Don't warn about missing Conscrypt ([`6f35422`](https://togithub.com/grpc/grpc-java/commit/6f3542297)). This is especially helpful when using TLS but not running on Android
-   android: For `UdsChannelBuilder`, use fake IP instead of localhost ([`a908b5e`](https://togithub.com/grpc/grpc-java/commit/a908b5e40)). This avoids an unnecessary DNS lookup
-   xds: Add xDS node ID in select control plane errors to enable cross-referencing with control plane logs when debugging ([`f3cf7c3`](https://togithub.com/grpc/grpc-java/commit/f3cf7c3c7))
-   xds: Enhanced how ADS stream terminations are handled, specifically addressing cases where a response has or hasn't been received (#&#8203;2e9c3e19f)
-   binder: Update status code documentation for Android 11's package visibility rules. ([#&#8203;11551](https://togithub.com/grpc/grpc-java/issues/11551)) ([`99be6e9`](https://togithub.com/grpc/grpc-java/commit/99be6e985))
-   binder: Update binderDied() error description to spell out the possibilities for those unfamiliar with Android internals. ([#&#8203;11628](https://togithub.com/grpc/grpc-java/issues/11628)) ([`46c1b38`](https://togithub.com/grpc/grpc-java/commit/46c1b387f))
-   example-gauth: Use application default creds instead of file argument ([#&#8203;11595](https://togithub.com/grpc/grpc-java/issues/11595)) ([`94a0a0d`](https://togithub.com/grpc/grpc-java/commit/94a0a0d1c))
-   opentelemetry: Experimental OpenTelemetry tracing is available. Set the `GRPC_EXPERIMENTAL_ENABLE_OTEL_TRACING` environment variable to `true` to enable tracing support in `GrpcOpenTelemetry` ([#&#8203;11409](https://togithub.com/grpc/grpc-java/issues/11409), [#&#8203;11477](https://togithub.com/grpc/grpc-java/issues/11477))([`043ba55`](https://togithub.com/grpc/grpc-java/commit/043ba55), [`421e237`](https://togithub.com/grpc/grpc-java/commit/421e237))

##### Dependencies

-   Updated protobuf-java to 3.25.5. This helps avoid CVE-2024-7254 ([`2ff837a`](https://togithub.com/grpc/grpc-java/commit/2ff837ab6))

Thanks to:\
[@&#8203;Juneezee](https://togithub.com/Juneezee)\
[@&#8203;lgalfaso](https://togithub.com/lgalfaso)\
[@&#8203;bestbeforetoday](https://togithub.com/bestbeforetoday)\
[@&#8203;hlx502](https://togithub.com/hlx502)\
[@&#8203;JoeCqupt](https://togithub.com/JoeCqupt)

</details>

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Author: cq-bot

build.gradle

@@ -23,7 +23,7 @@ repositories {
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-def grpcVersion = '1.68.0'
+def grpcVersion = '1.68.1'
 def protobufVersion = '4.28.3'
 def protocVersion = protobufVersion