Update workflow

Author: M0diis

.github/workflows/build.yml

@@ -13,17 +13,17 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 11
+      - name: Set up JDK 21
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
       - name: Build with Gradle
         uses: gradle/gradle-build-action@v2.4.2
         with:
           arguments: shadowJar
       - name: Upload jarfiles
         if: github.event_name != 'pull_request'
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           path: plugin/build/libs/*.jar