build(deps): bump io.grpc.version from 1.66.0 to 1.68.2

Bumps `io.grpc.version` from 1.66.0 to 1.68.2.

Updates `io.grpc:grpc-protobuf` from 1.66.0 to 1.68.2
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.2)

Updates `io.grpc:grpc-netty` from 1.66.0 to 1.68.2
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.2)

Updates `io.grpc:grpc-stub` from 1.66.0 to 1.68.2
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.2)

Updates `io.grpc:grpc-services` from 1.66.0 to 1.68.2
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.66.0...v1.68.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -22,7 +22,7 @@
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
 
-        <io.grpc.version>1.66.0</io.grpc.version>
+        <io.grpc.version>1.68.2</io.grpc.version>
         <com.google.protobuf.protoc.version>4.28.1</com.google.protobuf.protoc.version>
     </properties>