Fix continue-on-error failure

.github/workflows/continuous-integration.yml

@@ -33,22 +33,28 @@ jobs:
           - "7.4"
         dependencies: [locked]
         os: [ubuntu-latest]
+        experimental: [false]
         include:
           - php-version: 5.3
             dependencies: highest
             os: ubuntu-latest
+            experimental: false
           - php-version: 5.3
             dependencies: lowest
             os: ubuntu-latest
+            experimental: false
           - php-version: 7.4
             dependencies: highest
             os: ubuntu-latest
+            experimental: false
           - php-version: 7.4
             os: windows-latest
             dependencies: locked
+            experimental: false
           - php-version: 7.4
             os: macos-latest
             dependencies: locked
+            experimental: false
           - php-version: 8.0
             dependencies: highest
             os: ubuntu-latest