Bump kotlin.version from 2.1.21 to 2.2.0 in /protobuf-maven-plugin/src/it/setup (#727)

Author: dependabot[bot]

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

@@ -34,7 +34,7 @@
 
   <properties>
     <grpc.version>1.73.0</grpc.version>
-    <kotlin.version>2.1.21</kotlin.version>
+    <kotlin.version>2.2.0</kotlin.version>
     <proto-google-common-protos.version>2.59.0</proto-google-common-protos.version>
     <scala.version>3.7.1</scala.version>
     <scalapb.version>0.11.17</scalapb.version>