Bump mike from 2.1.0 to 2.1.1 (#571)

Bumps [mike](https://github.com/jimporter/mike) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/jimporter/mike/releases)
- [Changelog](https://github.com/jimporter/mike/blob/master/CHANGES.md)
- [Commits](jimporter/mike@v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: mike
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Thibaut Durand <[email protected]>