Bump the gradle group with 4 updates

Bumps the gradle group with 4 updates: [io.grpc:grpc-protobuf](https://github.com/grpc/grpc-java), [io.grpc:grpc-stub](https://github.com/grpc/grpc-java), [io.grpc:grpc-netty-shaded](https://github.com/grpc/grpc-java) and [com.google.protobuf:protobuf-java](https://github.com/protocolbuffers/protobuf).


Updates `io.grpc:grpc-protobuf` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

Updates `io.grpc:grpc-stub` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

Updates `io.grpc:grpc-netty-shaded` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

Updates `com.google.protobuf:protobuf-java` from 4.28.2 to 4.28.3
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](https://github.com/protocolbuffers/protobuf/commits)

Updates `io.grpc:grpc-stub` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

Updates `io.grpc:grpc-netty-shaded` from 1.68.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.68.0...v1.68.1)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: com.google.protobuf:protobuf-java
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: io.grpc:grpc-stub
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
...

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

build.gradle

@@ -83,8 +83,8 @@ tasks.sourcesJar {
 // All it does is complain about generated code.
 javadoc { options.addStringOption('Xdoclint:none', '-quiet') }
 
-def grpcVersion = "1.68.0"
-def protocVersion = "4.28.2"
+def grpcVersion = "1.68.1"
+def protocVersion = "4.28.3"
 def authzedProtoCommit = "v1.38.0"
 def bufDir = "${buildDir}/buf"
 def protocPlatformTag = project.findProperty('protoc_platform') ? ":${protoc_platform}" : ""