Update php Docker tag to v8.4

| datasource | package | from | to  |
| ---------- | ------- | ---- | --- |
| docker     | php     | 8.3  | 8.4 |

Dockerfile

@@ -1,4 +1,4 @@
-FROM php:8.3
+FROM php:8.4
 
 # git needed for Infection
 RUN apt-get update \