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

This introduces a comprehensive migration framework for Active Context
and adds collection management capabilities through database-specific executors.
These changes enable systematic database schema management and provide a unified
way to create and manage collections across different database backends.

Key changes:
- Introduce migration framework with version tracking and batch operation support
- Add database-specific executors for managing collections (PostgreSQL, Elasticsearch, OpenSearch)
- Implement partition strategy for handling sharded collections
- Move prefix configuration from Client to Adapter level
- Add migrations path configuration support

Technical details:
- Add Migration base class with versioning support (V1_0)
- Implement BatchOperationResult for tracking long-running operations
- Add collection creation with field type support (bigint, prefix, vector)
- Add partition management with naming strategy
- Add support for creating indices on fields based on database capabilities
- Implement database-specific collection creation logic:
  * PostgreSQL: Partitioned tables with vector support
  * Elasticsearch: Index templates and aliases
  * OpenSearch: Base executor structure (implementation pending)

The migration framework follows a similar pattern to ActiveRecord migrations,
with timestamped migration files and version tracking. Collections can be
created with specific field types and indexing options, which are translated
to the appropriate database-specific implementations.

Migration files should be placed in ee/db/active_context/migrate/ by default,
but this path can be configured through ActiveContext::Config.

Updates semver_dialect from 3.4.5 to 3.6.0.
This version supports swift versions.
Changelog: added

The gem was introduced 10 years ago in
https://gitlab.com/gitlab-org/gitlab/-/commit/07ac873037f8daf8b5368a5dfe4299d07420f6d4.

Its latest update was in 2020. We still use a 2016 version.

If people want to use that gem, they can install it locally.

As per https://gitlab.com/gitlab-org/gitlab/-/issues/498286

Changelog: added

Both Rust gems need to be updated together because they
depend on rb-sys ~> 0.9.109.

The prometheus-client-mmap update fixes a seg fault happening in
staging:
https://gitlab.com/gitlab-org/ruby/gems/prometheus-client-mmap/-/merge_requests/196
(https://gitlab.com/gitlab-org/ruby/gems/prometheus-client-mmap/-/issues/69).

Changelog: changed

This was originally added in 2015
(https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/1874) as
part of CI, but bundler-audit has since been removed and deprecated in
GitLab (https://gitlab.com/gitlab-org/gitlab/-/issues/289832).
We can remove this from our CI jobs.

This adds support for Ruby 3.4.

* Changes: https://github.com/mudge/re2/blob/main/CHANGELOG.md
* Diff: https://my.diffend.io/gems/re2/2.7.0/2.15.0

Changelog: changed