removed php81

Author: kokspflanze

.github/workflows/continuous-integration.yml

@@ -25,6 +25,6 @@ jobs:
     name: "PHPUnit"
     uses: "doctrine/.github/.github/workflows/continuous-integration.yml@6.0.0"
     with:
-      php-versions: '["8.1", "8.2", "8.3", "8.4", "8.5"]'
+      php-versions: '["8.2", "8.3", "8.4", "8.5"]'
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}