fix(deps): update dependency prom-client to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
prom-client	^14.2.0 -> ^15.0.0

---

Release Notes

siimon/prom-client (prom-client)

v15.0.0

Compare Source

Breaking

• drop support for Node.js versions 10, 12, 14, 17 and 19

Changed

• Refactor histogram internals and provide a fast path for rendering metrics to
  Prometheus strings when there are many labels shared across different values.
• Disable custom content encoding for pushgateway delete requests in order to
  avoid failures from the server when using Content-Encoding: gzip header.
• Refactor escapeString helper in lib/registry.js to improve performance and
  avoid an unnecessarily complex regex.
• Cleanup code and refactor to be more efficient
• Correct TS types for working with OpenMetrics
• Updated Typescript and Readme docs for setToCurrentTime() to reflect units as seconds.
• Do not ignore error if request to pushgateway fails
• Make sure to reject the request to pushgateway if it times out

Added

• Support for OpenMetrics and Exemplars

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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

♻ Rebasing: Whenever PR becomes conflicted, 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 has been generated by Mend Renovate. View repository job log here.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 15.x releases. But if you manually upgrade to 15.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.