Update main.yml: align the number of GWT workers with the 4CPUs of the runner

.github/workflows/main.yml

@@ -35,7 +35,7 @@ jobs:
         env: # Or as an environment variable
           APP_PARAMETERS: "-Daws.region=eu-west-1 -Dgoogle.maps.authenticationparams=${{ secrets.GOOGLE_MAPS_AUTHENTICATIONPARAMS }} -Daws.s3.test.s3AccessId=${{ secrets.AWS_S3_TEST_S3ACCESSID }} -Daws.s3.test.s3AccessKey=${{ secrets.AWS_S3_TEST_S3ACCESSKEY }}"
         run: |
-          ./configuration/buildAndUpdateProduct.sh -x 60 build 2>&1 | tee build.log
+          ./configuration/buildAndUpdateProduct.sh -x 4 build 2>&1 | tee build.log
       - name: Collect Test Reports
         uses: dorny/test-reporter@v1
         if: always()