Update jdk

Author: TheApplePieGod

.github/workflows/release-client.yml

@@ -147,10 +147,10 @@ jobs:
       - name: Set up Google Cloud SDK
         uses: 'google-github-actions/setup-gcloud@v1'
 
-      - name: Set up JDK 8
+      - name: Set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: 8
+          java-version: 21
           distribution: adopt
 
       - name: Download all client artifacts