I manually reviewed

    $ git diff 8.5.1+ce.0-1-ge732b39..8.6.5+ce.0-0-g342f8be --  \
        files/gitlab-config-template/gitlab.rb.template \
        files/gitlab-cookbooks/gitlab/attributes/default.rb

in omnibus-gitlab, and module proxy_cache and http2 changes, which we
already handled in 2 previous patches, there is nothing more interesting
for us.