ci: update jdk

Author: RedVortexDev

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: '17'
+          java-version: '21'
       - name: Generate proto docs
         run: ./gradlew generateProto
       - name: Checkout Wiki