Use laravel-constraint in CI (#41)

Fixes Laravel version constraints on GitHub Actions

.github/workflows/php.yml

@@ -53,22 +53,23 @@ jobs:
           - "8.0"
           - "8.1"
           - "8.2"
-        laravel-constrain:
+        laravel-constraint:
           - "9.*"
           - "10.*"
         dependencies:
           - "lowest"
           - "highest"
         exclude:
-          - laravel-constrain: "10.*"
-            php-version: "8.0"
+          - php-version: "8.0"
+            laravel-constraint: "10.*"
+
     steps:
       - name: "Set up PHP"
         uses: "shivammathur/setup-php@v2"
         with:
           php-version: "${{ matrix.php-version }}"
-          extensions: mbstring, intl
-          coverage: xdebug
+          extensions: "mbstring, intl"
+          coverage: "xdebug"
 
       - name: "Checkout code"
         uses: "actions/checkout@v3"
@@ -77,6 +78,7 @@ jobs:
         uses: "ramsey/composer-install@v2"
         with:
           dependency-versions: "${{ matrix.dependencies }}"
+          composer-options: "--with=laravel/framework:${{ matrix.laravel-constraint }}"
 
       - name: "Execute unit tests"
         run: "composer run-script test"