Allow future PHP releases to fail continuous integration tests

Author: zachborboa

.github/workflows/ci.yml

@@ -21,9 +21,13 @@ jobs:
           - '7.3'
           - '7.4'
           - '8.0'
-          - '8.1'
+        future-release: [false]
+        include:
+          - php: '8.1'
+            future-release: true
       fail-fast: false
     name: PHP ${{ matrix.php }}
+    continue-on-error: ${{ matrix.future-release }}
 
     steps:
       - name: Set up php