build: make gradlew executable

Author: HappyAreaBean

.github/workflows/dev-jar.yml

@@ -16,6 +16,8 @@ jobs:
         with:
           distribution: 'adopt'
           java-version: '8'
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
       - name: Build with Gradle
         run: |
           ./gradlew jar snapshotVersion