chore(github): Enable PHP 8.4 testing (#3490725)

Author: klausi

.github/workflows/testing.yml

@@ -7,12 +7,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
         extra-tests: ['0']
-        # We only need to run PHPStan and Druapl core regression tests once on
+        # We only need to run PHPStan and Drupal core regression tests once on
         # the latest PHP version.
         include:
-          - php-versions: '8.3'
+          - php-versions: '8.4'
             extra-tests: '1'
     steps:
       - name: Checkout Coder