feat(deps): update ghcr.io/renovatebot/renovate docker tag to v39.8.0

This MR contains the following updates:

Package	Update	Change
ghcr.io/renovatebot/renovate (source)	minor	39.7.5 -> 39.8.0

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Release Notes

renovatebot/renovate (ghcr.io/renovatebot/renovate)

v39.8.0

Compare Source

Features

• preset: Add SlackNet monorepo (#​31589) (94f67a0)

Code Refactoring

• bitbucket-server: update runtime pr list (#​32192) (cb539f8)

v39.7.6

Compare Source

Bug Fixes

• config: set npmToken in npmrc when not in encrypted (#​31815) (2194c22)

Miscellaneous Chores

• deps: update docker/dockerfile docker tag to v1.11.1 (#​32412) (d7d701c)

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