Update Ruby production dependencies (major)

This MR contains the following updates:

Package	Update	Change
activesupport	major	~> 5.2.0 -> ~> 7.0.0
ougai	major	~> 1.9.1 -> ~> 2.0.0
simplecov-cobertura	major	~> 1.4.0 -> ~> 2.1.0
sucker_punch	major	~> 2.1.0 -> ~> 3.0.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

---

Configuration

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

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

♻️ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

👻 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.