Update php Docker tag to v8.4.15

Author: renovate-bot

.drone.yml

@@ -9,7 +9,7 @@ steps:
     commands:
       - composer install
   - name: build
-    image: php:8.4.13@sha256:a627efe3590141fb90893d2db373020b67c0f297a05a92ab1e4fd2f9fb8afd86
+    image: php:8.4.15@sha256:51c7c09ee1642a40c4467a092358bb5c6abd9fd60f2309ed28cae13d745f4ad0
     commands:
       - ./vendor/bin/daux generate
   - name: deploy