Quote versions in YAML files to avoid interpretation (#96)

Author: yann-eugone

.github/workflows/tests.yml

@@ -13,14 +13,14 @@ jobs:
     strategy:
       matrix:
         include:
-          - php-version: 8.0
-            symfony-version: 5.4.*
-          - php-version: 8.0
-            symfony-version: 6.0.*
-          - php-version: 8.2
-            symfony-version: 5.4.*
-          - php-version: 8.2
-            symfony-version: 6.2.*
+          - php-version: '8.0'
+            symfony-version: '5.4.*'
+          - php-version: '8.0'
+            symfony-version: '6.0.*'
+          - php-version: '8.2'
+            symfony-version: '5.4.*'
+          - php-version: '8.2'
+            symfony-version: '6.2.*'
     steps:
       - name: "Checkout"
         uses: actions/checkout@v2