Bump protocolbuffers/kotlin v34.1 kotlin compiler version (#2366)

Seems like this was maybe bumped here:

protocolbuffers/protobuf@763c5da#diff-6136fc12446089c3db7360e923203dd114b6a1466252e71667c6791c20fe6bdcR38

Failing to compile upstream.

Similar to
c3b930c.

Author: stefanvanburen

plugins/protocolbuffers/kotlin/v34.1/buf.plugin.yaml

@@ -14,14 +14,15 @@ registry:
   maven:
     compiler:
       kotlin:
-        version: 1.8.22
+        api_version: "2.1"
+        version: "2.2.21"
     deps:
       - com.google.protobuf:protobuf-kotlin:4.34.1
-      - org.jetbrains.kotlin:kotlin-stdlib:1.8.22
-      - org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22
+      - org.jetbrains.kotlin:kotlin-stdlib:2.2.21
+      - org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.2.21
     additional_runtimes:
       - name: lite
         deps:
           - com.google.protobuf:protobuf-kotlin-lite:4.34.1
-          - org.jetbrains.kotlin:kotlin-stdlib:1.8.22
+          - org.jetbrains.kotlin:kotlin-stdlib:2.2.21
         opts: [lite]

plugins/protocolbuffers/kotlin/v34.1/pom.xml

@@ -12,12 +12,12 @@
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib</artifactId>
-      <version>1.8.22</version>
+      <version>2.2.21</version>
     </dependency>
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
       <artifactId>kotlin-stdlib-jdk8</artifactId>
-      <version>1.8.22</version>
+      <version>2.2.21</version>
     </dependency>
     <dependency>
       <groupId>com.google.protobuf</groupId>
@@ -46,8 +46,9 @@
       <plugin>
         <groupId>org.jetbrains.kotlin</groupId>
         <artifactId>kotlin-maven-plugin</artifactId>
-        <version>1.8.22</version>
+        <version>2.2.21</version>
         <configuration>
+          <apiVersion>2.1</apiVersion>
         </configuration>
       </plugin>
     </plugins>