Bump indexmap from 1.7.0 to 1.9.2 (#802)

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.7.0 to 1.9.2.
- [Release notes](https://github.com/bluss/indexmap/releases)
- [Changelog](https://github.com/bluss/indexmap/blob/master/RELEASES.md)
- [Commits](indexmap-rs/indexmap@1.7.0...1.9.2)

---
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>

Cargo.toml

@@ -47,7 +47,7 @@ version = "^0.15.6"
 features = ["rayon"]
 
 [dependencies.indexmap]
-version = "1.7"
+version = "1.9"
 features = ["rayon"]
 
 [profile.release]

rustworkx-core/Cargo.toml

@@ -23,7 +23,7 @@ version = "0.12"
 features = ["rayon"]
 
 [dependencies.indexmap]
-version = "1.7"
+version = "1.9"
 features = ["rayon"]
 
 [dev-dependencies]