Update gradle.yml

.github/workflows/gradle.yml

@@ -33,7 +33,7 @@ jobs:
     - name: Setup Gradle
       uses: gradle/actions/setup-gradle@417ae3ccd767c252f5661f1ace9f835f9654f2b5 # v3.1.0
     - name: Build with Gradle Wrapper
-      run: ./gradlew shadowJar -b alt.gradle
+      run: ./gradlew clean shadowJar -b alt.gradle
 
     # NOTE: The Gradle Wrapper is the default and recommended way to run Gradle (https://docs.gradle.org/current/userguide/gradle_wrapper.html).
     # If your project does not have the Gradle Wrapper configured, you can use the following configuration to run Gradle with a specified version.