update JDK to 21 for GitHub actions

Author: Revxrsal

.github/workflows/build.yml

@@ -14,10 +14,10 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
 
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v2
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'microsoft'
 
       - name: Build JAR

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: corretto
-          java-version: 17
+          java-version: 21
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v3