Bump grpc.version from 1.66.0 to 1.68.1 in /lang/java

Bumps `grpc.version` from 1.66.0 to 1.68.1.

Updates `io.grpc:grpc-core` from 1.66.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.1)

Updates `io.grpc:grpc-stub` from 1.66.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.1)

Updates `io.grpc:grpc-netty` from 1.66.0 to 1.68.1
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.1)

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

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

lang/java/pom.xml

@@ -42,7 +42,7 @@
     <commons-compress.version>1.27.1</commons-compress.version>
     <commons-text.version>1.12.0</commons-text.version>
     <commons-lang3.version>3.17.0</commons-lang3.version>
-    <grpc.version>1.66.0</grpc.version>
+    <grpc.version>1.68.1</grpc.version>
     <hadoop.version>3.3.6</hadoop.version>
     <hamcrest.version>2.2</hamcrest.version>
     <jackson-bom.version>2.17.2</jackson-bom.version>