Update renovate/renovate Docker tag to v31.68.3

This MR contains the following updates:

Package	Type	Update	Change
renovate/renovate	Kustomization	patch	31.68.1 -> 31.68.3

---

Release Notes

renovatebot/renovate

v31.68.3

31.68.3 (2022-02-07)

Bug Fixes

• maven: Revert "fix: remove default maven central registry" (#​14058) (d555c5c)

v31.68.2

31.68.2 (2022-02-07)

Bug Fixes

• logging: Added check for log level value (#​13941) (85cf82e)

Miscellaneous Chores

• deps: update node.js to d160e53 (#​14049) (968e29f)

Code Refactoring

• datasource/crate: Enable strict null checks (#​13915) (c1555ef)
• set importsNotUsedAsValues to error (#​14052) (3b7e9a1)
• versioning/poetry: Enable strict null checks (#​14028) (1f05297)
• versioning: Enable strict null checks (#​14053) (c966eb1)

---

Configuration

📅 Schedule: "on monday" (UTC).

🚦 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.