chore(deps): update php docker tag to v8.5.6 (#199)

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

Author: renovate[bot]

containers/php/Dockerfile

@@ -1,7 +1,7 @@
 ARG PHP_EXTENSIONS="pcntl redis"
 ARG ADDITIONAL_PACKAGES="bash rclone sqlite"
 
-FROM php:8.5.5-fpm-alpine AS base
+FROM php:8.5.6-fpm-alpine AS base
 WORKDIR /var/www/html
 # install software needed for all environments
 COPY --from=docker.io/composer:2.9.7 /usr/bin/composer /usr/local/bin/composer