The version constraint on oj seems very strict, so let's relax it a
little bit, so that the version can be bumped independently in the
main lockfile.

- Fix breaking changes introduced by 0.28.0

This reverts merge request !172742

There are many RuboCop cops used internally, which have inline
documentation.

These cops can now have documentation generated for them automatically,
so GitLab developers and contributors can reference our documentation
and examples, to better understand the cops as well as the reasoning
behind our decisions.

The version constraint on json seems very strict, so let's relax it a
little bit, so that the version can be bumped independently in the
main lockfile.

Bumping the version of Truncato fixes a problem with mangled non-ASCII
characters in the `simple_search_highlight_and_truncate` method.

Changelog: fixed

This enables support for native support for checksums:
https://bundler.io/blog/2024/12/19/bundler-v2-6.html

Relates to:

* https://gitlab.com/gitlab-org/gitlab/-/issues/417493
* https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/8935

Changelog: changed

The version constraint on json seems very strict, so let's relax it a
little bit, so that the version can be bumped independently in the
main lockfile.

Changelog: fixed

Following the first few steps of "Verify upcoming release
of gitlab-styles" from [Checklist][1].

Specifically, ran:
```console
$ bundle install && \
  bundle exec bundler-checksum init && \
  bundle install --gemfile Gemfile.next && \
  cp Gemfile.lock Gemfile.next.lock && \
  BUNDLE_GEMFILE=Gemfile.next bundle lock && \
  BUNDLE_GEMFILE=Gemfile.next bundle exec bundler-checksum init && \
  bundle exec rubocop
...
41153 files inspected, 127 offenses detected, 124 offenses autocorrectable
```

[1]: https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/merge_request_templates/New%20Version%20of%20gitlab-styles.md#checklist

Issue: https://gitlab.com/gitlab-com/request-for-help/-/issues/2235
Upstream: https://github.com/mperham/connection_pool/issues/172

Changelog: fixed