chore: added 8.1 as experimental to tests workflow

Author: alexsoft

.github/workflows/tests.yml

@@ -7,11 +7,17 @@ on:
 jobs:
     tests:
         runs-on: ubuntu-latest
+        continue-on-error: ${{ matrix.experimental }}
         strategy:
             fail-fast: true
             matrix:
                 php: [7.3, 7.4, 8.0]
                 stability: [prefer-lowest, prefer-stable]
+                experimental: [false]
+                include:
+                    - php: 8.1
+                      stability: prefer-stable
+                      experimental: true
 
         name: Tests on PHP ${{ matrix.php }} - ${{ matrix.stability }}