Fix Github Actions workflow

Author: Naktibalda

.github/workflows/main.yml

@@ -24,15 +24,15 @@ jobs:
           coverage: none
 
       - name: Checkout Symfony 4.4 Sample
-        if: matrix.symfony == "4.4.*"
+        if: "matrix.symfony == '4.4.*'"
         uses: actions/checkout@v2
         with:
           repository: Codeception/symfony-module-tests
           path: framework-tests
           ref: 4.4_codecept5
 
       - name: Checkout Symfony 5.4 Sample
-        if: matrix.symfony == "5.4.*"
+        if: "matrix.symfony == '5.4.*'"
         uses: actions/checkout@v2
         with:
           repository: Codeception/symfony-module-tests