chore(workflows/tests): remove php 8.1 test (#8)

Author: ygnice

.github/workflows/tests.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: [ '8.0', '8.1' ]
+        php-versions: [ '8.0' ]
         stability: [ 'prefer-stable' ]
 
     services: