Bump baseline-browser-mapping from 2.10.37 to 2.11.21 in /ui-test

Bumps [baseline-browser-mapping](https://github.com/web-platform-dx/baseline-browser-mapping) from 2.10.37 to 2.11.21.
- [Release notes](https://github.com/web-platform-dx/baseline-browser-mapping/releases)
- [Commits](web-platform-dx/baseline-browser-mapping@v2.10.37...v2.11.21)

---
updated-dependencies:
- dependency-name: baseline-browser-mapping
  dependency-version: 2.11.21
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]