feat: drop support for PHP < 8.1, symfony < 6.4

Author: Chris8934

.github/workflows/ci.yml

@@ -64,7 +64,9 @@ jobs:
       matrix:
         php: [ '8.1', '8.2', '8.3', '8.4', '8.5' ]
         sf_version: [ '6.4.*', '7.4.*' ]
-
+        exclude:
+          - php: '8.1'
+            sf_version: '7.4.*'
 
     steps:
       - name: "Checkout code"