fix/disable-test-php-8-1

Author: Brice Mangeat

.github/workflows/continuous_integration.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         install-args: ['', '--prefer-lowest']
-        php-version: ['7.4', '8.0', '8.1']
+        php-version: ['7.4', '8.0']
       fail-fast: false
 
     steps: