wip(ci): use java 21

.github/workflows/build.yaml

@@ -19,10 +19,15 @@ jobs:
           fetch-depth: 0
       - name: Cache
         uses: gradle/[email protected]
-      - name: Set up JDK 17
+      # - name: Set up JDK 17
+      #   uses: actions/setup-java@v3
+      #   with:
+      #     java-version: '17'
+      #     distribution: 'temurin'
+      - name: Set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
       - name: Download and Install Octo CLI
         run: |