Update Pellet runtime JVM to 22 (#8827)

frameworks/Kotlin/pellet/pellet.dockerfile

@@ -4,7 +4,7 @@ COPY sample/build.gradle.kts build.gradle.kts
 COPY sample/src src
 RUN gradle clean shadowJar --no-daemon
 
-FROM openjdk:21-jdk-buster
+FROM openjdk:22-jdk-buster
 WORKDIR /sample
 COPY --from=gradle /sample/build/libs/sample-1.0.0-all.jar app.jar