chore(deps): update dependency prometheus-client to v4.2.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prometheus-client	4.2.1 -> 4.2.3

---

Release Notes

prometheus/client_ruby (prometheus-client)

v4.2.3

Compare Source

Codename: Now with 25% fewer test dependencies!

Small improvements

• #​308 Declare base64 gem
  dependency, ready for Ruby 3.4:
  Ruby 3.4 and above will require an explicit dependency on base64 as it will no
  longer be included with CRuby. This gets us ready for that change.

v4.2.2

Compare Source

Codename: 🎃🦇 Spooky type conversion 🦇🎃

Bug fixes

• #​296 Stringify non-string job
  names in push client:
  Previously, an error would be raised if you passed a symbol as the job name, which
  is inconsistent with how we handle label values in the rest of the client. This
  change converts the job name to a string before trying to use it.
• #​297 Stringify grouping key
  values in push client:
  Same thing as #​296, but for grouping key values.

---

Configuration

📅 Schedule: Branch creation - "before 3am on the first day of the month" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.