Remove experimental for PHP 8.1 on CI

Author: ruudk

.github/workflows/build-and-test.yml

@@ -3,15 +3,11 @@ on: [push, pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest
-    continue-on-error: ${{ matrix.experimental }}
+    continue-on-error: false
     strategy:
       fail-fast: false
       matrix:
-        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
-        experimental: [false]
-        include:
-          - php: '8.1'
-            experimental: true
+        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
     steps:
       - name: Checkout
         uses: actions/checkout@v2