Update php Docker tag to v8.4

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


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -1,6 +1,6 @@
 FROM composer:2 AS composer
 
-FROM php:8.3-alpine
+FROM php:8.4-alpine
 
 COPY --from=composer /usr/bin/composer /usr/bin/composer