build(deps): bump composer from 2.7.4 to 2.7.6

Bumps composer from 2.7.4 to 2.7.6.

---
updated-dependencies:
- dependency-name: composer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

php.Dockerfile

@@ -1,4 +1,4 @@
-FROM composer:2.7.4 AS composer
+FROM composer:2.7.6 AS composer
 FROM php:8.3-apache
 
 COPY --from=composer /usr/bin/composer /usr/bin/composer