Bump indexmap from 1.6.0 to 1.6.1 (#2117)

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/bluss/indexmap/releases)
- [Commits](https://github.com/bluss/indexmap/compare/1.6.0...1.6.1)

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