task: set GH java version to 21

Author: jwilkinson87

.github/workflows/release.yaml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'jetbrains'
-          java-version: 22
+          java-version: 21
           cache: gradle
 
       - name: Build and Publish Artifact