Bump keepercommander in /docker/keepercommander (#34717)

Bumps [keepercommander](https://github.com/Keeper-Security/Commander) from 16.11.18 to 16.11.21.
- [Release notes](https://github.com/Keeper-Security/Commander/releases)
- [Commits](Keeper-Security/Commander@v16.11.18...v16.11.21)

---
updated-dependencies:
- dependency-name: keepercommander
  dependency-type: direct:production
  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>