Remove unsupported PHP version tests (#86)

Author: SilverFire

.github/workflows/behat-tests.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['8.1', '8.3']
+        php: ['8.3']
         coverage-driver: [pcov]
     name: PHP ${{ matrix.php }}
     steps: