Merge branch 'upgrade-annotate' into 'master'

Upgrade annotate from 2.6.10 to 2.7.0

We don’t have any tests for this, so no need to run them. [ci skip]

Includes compatibility with Rails 5.

Changelog: https://github.com/ctran/annotate_models/releases/tag/v2.7.0

Working towards #14286.

See merge request !3645