Force the PHPStan job to install a version of PHPUnit

Author: stevegrunwell

.github/workflows/static-code-analysis.yml

@@ -19,5 +19,8 @@ jobs:
       - name: Install Composer dependencies
         uses: ramsey/composer-install@v2
 
+      - name: Install PHPUnit
+        run: composer test -- --version
+
       - name: Run PHPStan
         run: composer static-analysis