drop php 8.1 support

.github/workflows/docker.yml

@@ -70,7 +70,6 @@ jobs:
       # See: https://docs.github.com/en/actions/using-jobs/using-a-matrix-for-your-jobs
       matrix:
         php_version:
-          - 8.1
           - 8.2
           - 8.3
         target_runtime: