add 8.4, fix typo in php versions

Author: tacman

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
         continue-on-error: ${{ !matrix.stable }}
         strategy:
             matrix:
-                php: ['8.0', 8.1', '8.2', '8.3']
+                php: ['8.0', '8.1', '8.2', '8.3','8.4']
                 stable: [true]
                 coverage: [true]
                 composer-flags: ['']