Test on PHP 8.4

Author: trowski

.github/workflows/ci.yml

@@ -22,16 +22,20 @@ jobs:
             ini-values: 'ffi.enable=false'
 
           - operating-system: 'ubuntu-latest'
-            php-version: '8.3'
+            php-version: '8.4'
+            ini-values: 'ffi.enable=false'
+
+          - operating-system: 'ubuntu-latest'
+            php-version: '8.4'
             job-description: 'with FFI'
 
           - operating-system: 'windows-latest'
-            php-version: '8.3'
+            php-version: '8.4'
             job-description: 'on Windows'
             ini-values: 'ffi.enable=false'
 
           - operating-system: 'macos-latest'
-            php-version: '8.3'
+            php-version: '8.4'
             job-description: 'on macOS'
             ini-values: 'ffi.enable=false'