Bump indexmap from 2.7.1 to 2.8.0 (#2559)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.7.1 to 2.8.0. - [Changelog](https://github.com/indexmap-rs/indexmap/blob/main/RELEASES.md) - [Commits](indexmap-rs/indexmap@2.7.1...2.8.0) --- updated-dependencies: - dependency-name: indexmap 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]