Bump indexmap from 2.10.0 to 2.11.0 in /autorust (#656)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.10.0 to 2.11.0.
- [Changelog](https://github.com/indexmap-rs/indexmap/blob/main/RELEASES.md)
- [Commits](indexmap-rs/indexmap@2.10.0...2.11.0)

---
updated-dependencies:
- dependency-name: indexmap
  dependency-version: 2.11.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]