Try again to use matrix overrides.

.github/workflows/build-2.x.yml

@@ -22,16 +22,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: ["7.4", "8.0"]
+        php-versions: ["7.4", "8.0", "8.1"]
         test-suite: ["kernel", "functional", "functional-javascript"]
-        drupal-version: ["9.4.x", "9.5.x-dev"]
+        drupal-version: ["9.4.x", "9.5.x-dev", "10.0.x-dev"]
         mysql: ["8.0"]
         allowed_failure: [false]
         include:
           - php-versions: "8.1"
             allowed_failure: true
-          - drupal-version: "10.0.x-dev"
-            allowed_failure: true
         exclude:
           - php-versions: "7.4"
             drupal-version: "10.0.x-dev"