Upgrade workflows to java 21

.github/workflows/build.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'adopt'
     - name: Build jar
       run: chmod +x ./gradlew && ./gradlew clean build

.github/workflows/buildAndRelease.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up JDK 17
+    - name: Set up JDK 21
       uses: actions/setup-java@v3
       with:
-        java-version: '17'
+        java-version: '21'
         distribution: 'adopt'
     - name: Build jar
       run: chmod +x ./gradlew && ./gradlew clean build