Bump io.grpc:grpc-bom from 1.68.1 to 1.68.2 (#871)

Bumps [io.grpc:grpc-bom](https://github.com/grpc/grpc-java) from 1.68.1 to 1.68.2.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.1...v1.68.2)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -317,7 +317,7 @@
         <maven.compiler.target>${java.version}</maven.compiler.target>
 
         <protobuf.version>4.28.3</protobuf.version>
-        <grpc.version>1.68.1</grpc.version>
+        <grpc.version>1.68.2</grpc.version>
     </properties>
 
 </project>