Add PHP 8.4 to workflows

Author: andypost

.github/workflows/ci.yml

@@ -102,6 +102,11 @@ jobs:
             dependencies: highest
             codecov: true
             php-ini-values: assert.exception=1, zend.assertions=1, opcache.enable=1, opcache.enable_cli=1, opcache.optimization_level=-1, opcache.jit_buffer_size=4096M, opcache.jit=1205
+          - os: ubuntu-latest
+            php-version: "8.4"
+            dependencies: highest
+            codecov: true
+            php-ini-values: zend.assertions=1, opcache.enable=1, opcache.enable_cli=1, opcache.optimization_level=-1, opcache.jit_buffer_size=4096M, opcache.jit=1205
 
     steps:
       - name: Checkout