Update .NET SDK

Update .NET SDK to version 8.0.403.

---
updated-dependencies:
- dependency-name: Microsoft.NET.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: aspnet-contrib-service-account[bot] <161750942+aspnet-contrib-service-account[bot]@users.noreply.github.com>

Author: aspnet-contrib-service-account[bot]

global.json

@@ -1,12 +1,12 @@
 {
   "sdk": {
-    "version": "8.0.402",
+    "version": "8.0.403",
     "allowPrerelease": true,
     "rollForward": "major"
   },
 
   "tools": {
-    "dotnet": "8.0.402"
+    "dotnet": "8.0.403"
   },
 
   "msbuild-sdks": {