Fix Gradlew permissions

Thanks Windows

.github/workflows/build.yml

@@ -25,6 +25,8 @@ jobs:
         run: |
           git config --global user.email "no-reply@github.com"
           git config --global user.name "Github Actions"
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
       - name: Patch SparklyPaper
         run: |
           ./gradlew applyPatches --stacktrace --no-daemon