fix(deps): update renovate/renovate docker tag to v31.81.2

This MR contains the following updates:

Package	Update	Change
renovate/renovate	patch	31.81.0 -> 31.81.2

---

Release Notes

renovatebot/renovate

v31.81.2

31.81.2 (2022-02-13)

Bug Fixes

• added filtering for empty depName (#​14037) (f83c82b)

Documentation

• preset: update :pinDependencies description (#​14144) (780a699)

v31.81.1

31.81.1 (2022-02-13)

Bug Fixes

• pr: intelligently merge prBodyColumns (#​14198) (c6b1cda)

Code Refactoring

• conan: retrieve raw content directly from GitHub (#​14195) (766d921)
• github: Convert datasources to class form (#​14124) (8a7abfd)

---

Configuration

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

🚦 Automerge: Enabled.

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

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

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.