Update gems

This MR contains the following updates:

Package	Type	Update	Change
faraday	ironbank-rubygems	minor	1.5.1 -> 1.6.0
fluent-plugin-prometheus	ironbank-rubygems	patch	2.0.1 -> 2.0.2
oj	ironbank-rubygems	patch	3.12.2 -> 3.12.3
oj		patch	3.12.2 -> 3.12.3

---

Configuration

📅 Schedule: At any time (no schedule defined).

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

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This MR will be recreated if closed unmerged. Get config help if that's undesired.

---

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

---

This MR has been generated by Renovate Bot.