Update docker
Update docker

Changes:

- https://github.com/docker-library/docker/commit/8b8d62e: Update 20.10 to 20.10.9
- https://github.com/docker-library/docker/commit/a5154f6: Merge pull request https://github.com/docker-library/docker/pull/332 from infosiftr/better-rc-exclusion
- https://github.com/docker-library/docker/commit/e129c04: Exclude RCs more explicitly when they do not apply

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