Remove cache and change shadowJar module in workflow

.github/workflows/gradle.yml

@@ -23,20 +23,11 @@ jobs:
         distribution: adopt
         java-version: '17'
 
-    - name: Cache Gradle
-      uses: actions/cache@v4.0.2
-      with:
-        path: ~/.gradle/caches
-        key: >-
-          ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*',
-          '**/gradle-wrapper.properties') }}
-        restore-keys: '${{ runner.os }}-gradle-'
-
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
 
     - name: Build with Gradle
-      run: ./gradlew clean shadowJar
+      run: ./gradlew clean plugin-core:shadowJar
 
     - name: Upload JAR file
       uses: actions/upload-artifact@v4.3.3