Fix: use gradle command directly instead of missing gradlew script

Author: Arbousier1

.github/workflows/main.yml

@@ -124,8 +124,7 @@ jobs:
       - name: Build with Gradle
         if: steps.check_changes.outputs.has_changes == 'true' || github.event.inputs.force_build == 'true'
         run: |
-          chmod +x gradlew
-          ./gradlew clean shadowJar --no-daemon
+          gradle clean shadowJar --no-daemon
           JAR_FILE=$(find plugin/build/libs -name "UltimateShop-*.jar" ! -name "*sources.jar" ! -name "*javadoc.jar" | head -1)
           if [ -n "$JAR_FILE" ]; then
             echo "Build successful!"