Run static analysis on PHP 8.1 (#9310)

This will make it easier to add code that leverages features only
defined since that version of PHP.

Author: greg0ire

.github/workflows/static-analysis.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "8.0"
+          - "8.1"
         dbal-version:
           - "default"
           - "2.13"
@@ -58,7 +58,7 @@ jobs:
       fail-fast: false
       matrix:
         php-version:
-          - "8.0"
+          - "8.1"
         dbal-version:
           - "default"
           - "2.13"