Test against Symfony 8 in CI

composer.json already allows symfony/http-foundation ^8 but the matrix
never exercised it. Symfony 8 requires PHP >= 8.4, hence the
exclusions for PHP 8.1-8.3.

Author: guillaume-sainthillier

.github/workflows/unit-tests.yaml

@@ -12,12 +12,18 @@ jobs:
         strategy:
             matrix:
                 php-version: [8.1, 8.2, 8.3, 8.4]
-                symfony-version: [^5, ^6, ^7]
+                symfony-version: [^5, ^6, ^7, ^8]
                 glide-version: [^2, ^3]
                 dependencies: [lowest, stable]
                 exclude:
                   - php-version: 8.1
                     symfony-version: ^7
+                  - php-version: 8.1
+                    symfony-version: ^8
+                  - php-version: 8.2
+                    symfony-version: ^8
+                  - php-version: 8.3
+                    symfony-version: ^8
         steps:
             - name: Checkout
               uses: actions/checkout@v4