chore(deps): pin dependencies

This MR contains the following updates:

Package	Type	Update	Change
docker/dockerfile	syntax	pinDigest	-> b6afd42
gitlab-registry.cern.ch/wordpress/wordpress-image	stage	pinDigest	-> 982d45f
php	final	minor	8.1-fpm -> 8.5-fpm
registry.cern.ch/docker.io/openresty/openresty	final	pinDigest	-> f9ef975

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