[minor] adjust ci matrix

.github/workflows/ci.yml

@@ -14,14 +14,11 @@ jobs:
       matrix:
         php: [7.4, 8.0]
         stability: [hightest]
-        symfony: [4.4.*, 5.2.*]
+        symfony: [4.4.*, 5.2.*, 5.3.*]
         include:
           - php: 7.4
             stability: lowest
             symfony: '*'
-          - php: 8.0
-            stability: highest
-            symfony: '@dev'
     steps:
       - name: Checkout code
         uses: actions/checkout@v2.3.3
@@ -35,10 +32,6 @@ jobs:
       - name: Install Symfony Flex
         run: composer global require --no-progress --no-scripts --no-plugins symfony/flex dev-main
 
-      - name: Set minimum-stability to dev
-        run: composer config minimum-stability dev
-        if: ${{ matrix.symfony == '@dev' }}
-
       - name: Install dependencies
         uses: ramsey/composer-install@v1
         with: