chore: Improve GitHub CI (#4)

Author: simbig

.github/workflows/continuous-integration.yml

@@ -109,7 +109,7 @@ jobs:
         run: vendor/bin/phpstan analyse --configuration=phpstan.neon
 
   tests:
-    name: "Tests"
+    name: "Tests - PHP ${{ matrix.php-version }}, Illuminate ${{ matrix.illuminate }}, ${{ matrix.dependencies }}"
 
     runs-on: ubuntu-latest
 
@@ -124,6 +124,13 @@ jobs:
           - locked
           - highest
 
+        illuminate:
+          - ^8.73
+          - ^9
+        exclude:
+          - php-version: 7.4
+            illuminate: ^9
+
     steps:
       - name: "Checkout"
         uses: actions/checkout@master
@@ -135,6 +142,9 @@ jobs:
           extensions: mbstring
           php-version: ${{ matrix.php-version }}
 
+      - name: "Install illuminate"
+        run: composer require "illuminate/support:${{ matrix.illuminate }}" --no-interaction --no-update
+
       - name: "Install lowest dependencies with composer"
         if: matrix.dependencies == 'lowest'
         run: composer update --prefer-lowest --no-interaction --no-progress --no-suggest

composer.json

@@ -54,9 +54,6 @@
       "ergebnis/composer-normalize": true,
       "infection/extension-installer": true
     },
-    "platform": {
-      "php": "7.4.24"
-    },
     "preferred-install": "dist",
     "sort-packages": true
   }