Use 4.0.2-SNAPSHOT version in gradle samples (#3085)

Author: jmini

appveyor.yml

@@ -50,7 +50,7 @@ build_script:
   # install openapi-generator locally
   - mvn clean install --quiet
   # run the locally installed openapi-generator-gradle-plugin
-  - gradle -PopenApiGeneratorVersion=4.0.2-SNAPSHOT -b modules\openapi-generator-gradle-plugin\samples\local-spec\build.gradle buildGoSdk --info
+  - gradle -b modules\openapi-generator-gradle-plugin\samples\local-spec\build.gradle buildGoSdk --info
 test_script:
   # restore test-related files
   - copy /b/v/y CI\samples.ci\client\petstore\csharp\OpenAPIClient\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj samples\client\petstore\csharp\OpenAPIClient\src\Org.OpenAPITools.Test\Org.OpenAPITools.Test.csproj

modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties

@@ -1 +1 @@
-openApiGeneratorVersion=4.0.1
+openApiGeneratorVersion=4.0.2-SNAPSHOT