Test with PHP 8.4 on CI

Author: ankane

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: 8.3
+          - php: 8.4
           - php: "8.1"
             composer: --prefer-lowest
     runs-on: ubuntu-latest