build(deps): bump io.grpc:grpc-stub in /sdk/java/grpc

Bumps [io.grpc:grpc-stub](https://github.com/grpc/grpc-java) from 1.68.2 to 1.69.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.2...v1.69.0)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

sdk/java/grpc/pom.xml

@@ -68,7 +68,7 @@
         <dependency>
             <groupId>io.grpc</groupId>
             <artifactId>grpc-stub</artifactId>
-            <version>1.68.2</version>
+            <version>1.69.0</version>
         </dependency>
 
     </dependencies>