Update CI configuration and .gitignore for PHP 8.3 and Ubuntu 24.04

Switched CI workflows to use PHP 8.3 and Ubuntu 24.04 for improved compatibility and support. Adjusted `.gitignore` to exclude `.phpunit.cache` and removed an obsolete PHPUnit cache file.

Author: Das-Ente

.github/workflows/ci.yaml

@@ -6,13 +6,13 @@ jobs:
 
   static-analysis:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.3'
 
       - name: Checkout Code
         uses: actions/checkout@v2
@@ -25,13 +25,13 @@ jobs:
 
   check-code-style:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.3'
 
       - name: Checkout Code
         uses: actions/checkout@v2
@@ -42,9 +42,9 @@ jobs:
       - name: Check Code Style
         run: composer phpcs-dry
 
-  testing-php81:
+  testing-php:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     strategy:
       fail-fast: false

.gitignore

@@ -3,3 +3,4 @@
 .php-cs-fixer.cache
 /build/
 **/.phpunit.result.cache
+/.phpunit.cache/