chore: addig 8.4 to ci

Author: JimTools

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest]
-        php-versions: ["8.1", "8.2", "8.3"]
+        php-versions: ["8.1", "8.2", "8.3", "8.4"]
         dependency-versions: ["highest"]
     runs-on: ${{ matrix.operating-system }}
     steps: