Update github action

Author: Huix97

.github/workflows/build.yml

@@ -13,18 +13,18 @@ jobs:
           fetch-depth: 0
           fetch-tags: true
 
-      - name: Setup JDK 17
+      - name: Setup JDK 21
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '21'
           distribution: 'temurin'
 
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v3.5.0
 
       - name: Build with Gradle
         run:
-          echo "FILE=$(find app/build/outputs/ci -name '*.jar')" >> $GITHUB_ENV
+          echo "FILE=$(find build/libs -name '*.jar')" >> $GITHUB_ENV
 
       - name: Upload a Build Artifact
         uses: actions/upload-artifact@v4.6.2