ci: Test different dependency versions (#15)

Author: theofidry

.github/workflows/tests.yaml

@@ -28,6 +28,9 @@ jobs:
                     - "unchanged"
                     - "6.*.*"
                     - "7.*.*"
+                dependency-versions:
+                    - "highest"
+                    - "lowest"
                 exclude:
                     - php: "8.1"
                       symfony: "7.*.*"
@@ -48,6 +51,8 @@ jobs:
 
             -   name: "Install Composer dependencies"
                 uses: "ramsey/composer-install@v2"
+                with:
+                    dependency-versions: "${{ matrix.dependency-versions }}"
 
             -   name: "Run tests"
                 run: "make phpunit"