fix(deps): Update grpc-java monorepo to v1.73.0 (#180)

This PR contains the following updates:

| Package | Type | Update | Change | Pending |
|---|---|---|---|---|
| [io.grpc:protoc-gen-grpc-java](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |
| [io.grpc:grpc-testing](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |
| [io.grpc:grpc-netty-shaded](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |
| [io.grpc:grpc-stub](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |
| [io.grpc:grpc-services](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |
| [io.grpc:grpc-protobuf](https://redirect.github.com/grpc/grpc-java) | dependencies | minor | `1.72.0` -> `1.73.0` | `1.74.0` |

---

### Release Notes

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

### [`v1.73.0`](https://redirect.github.com/grpc/grpc-java/releases/tag/v1.73.0)

##### API Changes

xds: Enable least request by default ([#&#8203;12062](https://redirect.github.com/grpc/grpc-java/issues/12062))
core: Delete the long-deprecated GRPC_PROXY_EXP env variable ([#&#8203;11988](https://redirect.github.com/grpc/grpc-java/issues/11988)) ([`908f9f1`](https://redirect.github.com/grpc/grpc-java/commit/908f9f19c)). This was experimental and has been warning when used since v1.8.0. Use the Java-standard -Dhttps.proxyHost and -Dhttps.proxyPort instead
api: Remove deprecated SubchannelPicker.requestConnection() ([`f79ab2f`](https://redirect.github.com/grpc/grpc-java/commit/f79ab2f16)). This API was replaced by LoadBalancer.requestConnection() in v1.22.0

##### Bug Fixes

config: prevents global stats config freeze in ConfiguratorRegistry.getConfigurators() ([#&#8203;11991](https://redirect.github.com/grpc/grpc-java/issues/11991)) ([`d4c46a7`](https://redirect.github.com/grpc/grpc-java/commit/d4c46a7f1))
xds: XdsDepManager should ignore updates after shutdown ([`25199e9`](https://redirect.github.com/grpc/grpc-java/commit/25199e9df)). This fixes a source of java.lang.NullPointerException: Cannot invoke "io.grpc.xds.XdsDependencyManager$RdsUpdateSupplier.getRdsUpdate()" because "routeSource" is null regression introduced in v1.72.0

##### Improvements

xds: listener type validation ([#&#8203;11933](https://redirect.github.com/grpc/grpc-java/issues/11933)) ([`c8d1e6e`](https://redirect.github.com/grpc/grpc-java/commit/c8d1e6e39))
xds: add the missing xds.authority metric defined in [gRFC A78](https://redirect.github.com/grpc/proposal/blob/master/A78-grpc-metrics-wrr-pf-xds.md#xdsclient) ([#&#8203;12018](https://redirect.github.com/grpc/grpc-java/issues/12018)) ([`6cd007d`](https://redirect.github.com/grpc/grpc-java/commit/6cd007d0d))

##### New Features

xds: float LRU cache across interceptors ([#&#8203;11992](https://redirect.github.com/grpc/grpc-java/issues/11992)) ([`7a08fdb`](https://redirect.github.com/grpc/grpc-java/commit/7a08fdb7f))
xds: propagate audience from cluster resource in gcp auth filter. This completes the gRFC A83, implementation of GCP Authentication Filter. ([#&#8203;11972](https://redirect.github.com/grpc/grpc-java/issues/11972)) ([`84c7713`](https://redirect.github.com/grpc/grpc-java/commit/84c7713b2))
opentelemetry: Implement grpc.lb.backend_service optional label ([`9619453`](https://redirect.github.com/grpc/grpc-java/commit/961945379)). This completes the [gRFC A89](https://redirect.github.com/grpc/proposal/blob/master/A89-backend-service-metric-label.md) implementation, which is enabled when requesting the new label

##### Documentation

api: Remove mention of "epoch" from Ticker.nanoTime() javadocs ([`84bd014`](https://redirect.github.com/grpc/grpc-java/commit/84bd01454))

</details>

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Author: cq-bot

build.gradle

@@ -23,7 +23,7 @@ repositories {
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-def grpcVersion = '1.72.0'
+def grpcVersion = '1.73.0'
 def protobufVersion = '4.31.1'
 def protocVersion = protobufVersion