Bump indexmap from 2.0.2 to 2.1.0

Bumps [indexmap](https://github.com/bluss/indexmap) from 2.0.2 to 2.1.0.
- [Changelog](https://github.com/bluss/indexmap/blob/master/RELEASES.md)
- [Commits](indexmap-rs/indexmap@2.0.2...2.1.0)

---
updated-dependencies:
- dependency-name: indexmap
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>