Update renovate/renovate Docker tag to v31.68.6

This MR contains the following updates:

Package	Type	Update	Change
renovate/renovate	Kustomization	patch	31.68.4 -> 31.68.6

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Release Notes

renovatebot/renovate

v31.68.6

31.68.6 (2022-02-07)

Bug Fixes

• remove quotations around git insteadOF url (#​14079) (33e9e5a)

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