Update workflow

Author: rappasoft

.github/workflows/run-tests.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ubuntu-latest, windows-latest]
-        php: [8.0]
+        php: [8.0, 7.4]
         laravel: [8.*]
         stability: [prefer-lowest, prefer-stable]
         include: