Bump kotlin.version in /protobuf-maven-plugin/src/it/setup

Bumps `kotlin.version` from 2.1.0 to 2.1.10.

Updates `org.jetbrains.kotlin:kotlin-bom` from 2.1.0 to 2.1.10
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.0...v2.1.10)

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 2.1.0 to 2.1.10

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

protobuf-maven-plugin/src/it/setup/pom.xml

@@ -35,7 +35,7 @@
   <properties>
     <grpc.version>1.70.0</grpc.version>
     <javax-annotation-api.version>1.3.2</javax-annotation-api.version>
-    <kotlin.version>2.1.0</kotlin.version>
+    <kotlin.version>2.1.10</kotlin.version>
     <protobuf.version>4.29.3</protobuf.version>
     <proto-google-common-protos.version>2.50.1</proto-google-common-protos.version>
     <scala.version>3.6.3</scala.version>