fix(workflows): add phpstan configuration to mutation job.

Author: terabytesoftw

.github/workflows/mutation.yml

@@ -20,5 +20,7 @@ name: mutation test
 jobs:
   mutation:
     uses: php-forge/actions/.github/workflows/infection.yml@v1
+    with:
+      phpstan: true
     secrets:
       STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}