use upload 3.0.0

Author: Tom-Ski

.github/workflows/main.yaml

@@ -33,7 +33,7 @@ jobs:
     - name: Build with Gradle
       run: ./gradlew build
     - name: Upload all output libs
-      uses: actions/upload-artifact@v2.1.4
+      uses: actions/upload-artifact@v3.0.0
       with:
         name: output-libs
         path: "*/build/libs"