Add PHP 8.4 to CI (#644)

Author: OskarStark

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php-versions: ['8.0', '8.1', '8.2', '8.3']
+                php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} Test on ubuntu-latest
         steps:
@@ -73,7 +73,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php-versions: ['8.0', '8.1', '8.2', '8.3']
+                php-versions: ['8.0', '8.1', '8.2', '8.3', '8.4']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} Test dev dependencies on ubuntu-latest
         steps:
@@ -169,7 +169,7 @@ jobs:
       runs-on: ubuntu-latest
       strategy:
         matrix:
-          php-versions: [ '8.1', '8.2', '8.3' ]
+          php-versions: [ '8.1', '8.2', '8.3', '8.4']
         fail-fast: false
       name: PHP ${{ matrix.php-versions }} (phpunit 10) Test on ubuntu-latest
       steps: