update gh action

Author: Wyvest

.github/workflows/build.yml

@@ -19,17 +19,17 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 10
 
       - name: Set up JDK 17
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.gradle/caches