remove php7.3 and older versions and add php8.1

Author: ddrv

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [7.0, 7.1, 7.2, 7.3, 7.4, 8.0]
+        php: [7.4, 8.0, 8.1]
 
     steps:
       - name: Checkout code