change java version to 21

Author: Guy Davenport

.github/workflows/publish-package.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@v4
         with:
-          java-version: '22'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Setup Gradle