chore(deps): update dependency composer/composer to v2.8.6 (#5719)

Signed-off-by: milkmaker <milkmaker@mailcow.de>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

data/Dockerfiles/phpfpm/Dockerfile

@@ -13,7 +13,7 @@ ARG MEMCACHED_PECL_VERSION=3.2.0
 # renovate: datasource=github-tags depName=phpredis/phpredis versioning=semver-coerced extractVersion=(?<version>.*)$
 ARG REDIS_PECL_VERSION=6.1.0
 # renovate: datasource=github-tags depName=composer/composer versioning=semver-coerced extractVersion=(?<version>.*)$
-ARG COMPOSER_VERSION=2.6.6
+ARG COMPOSER_VERSION=2.8.6
 
 RUN apk add -U --no-cache autoconf \
   aspell-dev \