Update renovate/renovate Docker tag to v36.78.6

This MR contains the following updates:

Package	Type	Update	Change
renovate/renovate	image	patch	36.78.3 -> 36.78.6

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Release Notes

renovatebot/renovate (renovate/renovate)

v36.78.6

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Bug Fixes

• datasource/docker: improve label efficiency (#​24193) (4bffe31)

v36.78.4

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Bug Fixes

• deps: update ghcr.io/containerbase/sidecar docker tag to v9.19.4 (#​24196) (f6140e1)

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