Fix github workflow (linux.yaml) (OpenAPITools#21743)

* remove with from workflow

* test with gradle 8.x

Author: wing328

.github/workflows/linux.yaml

@@ -10,9 +10,6 @@ on:
       - master
       - '[5-9]+.[0-9]+.x'
 
-env:
-  GRADLE_VERSION: '8.14.3'
-
 jobs:
   build:
     name: 'Build: JDK ${{ matrix.java }} (${{ matrix.os }})'
@@ -47,6 +44,10 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
+      - uses: gradle/actions/setup-gradle@v3
+        with:
+          gradle-version: '8.14.3'
+
       - name: Setup Maven
         uses: s4u/setup-maven-action@v1.18.0
         with:
@@ -69,8 +70,6 @@ jobs:
       - name: Test Gradle plugin usage
         shell: bash
         run: gradle --project-dir modules/openapi-generator-gradle-plugin/samples/local-spec buildGoSdk --stacktrace
-        with:
-          gradle-version: ${{ env.GRADLE_VERSION }}
 
       - name: Test Maven plugin integration
         if: matrix.java == '11'