gha: only install specific combination

Author: mfn

.github/workflows/run-integration-tests.yml

@@ -15,8 +15,8 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [8.3, 8.2, 8.1, 8.0, 7.4, 7.3]
-                laravel: [10.*, 9.*, 8.*]
+                php: [8.1]
+                laravel: [8.*]
                 exclude:
                   - php: 8.0
                     laravel: 10.*