Bump indexmap from 1.8.1 to 1.9.1

[dependabot]

Bumps indexmap from 1.8.1 to 1.9.1.

Changelog

Sourced from indexmap's changelog.

• 1.9.1

  • The MSRV now allows Rust 1.56.0 as well. However, currently hashbrown 0.12.1 requires 1.56.1, so users on 1.56.0 should downgrade that to 0.12.0 until there is a later published version relaxing its requirement.

• 1.9.0

  • MSRV: Rust 1.56.1 or later is now required.

  • The hashbrown dependency has been updated to version 0.12.

  • IterMut and ValuesMut now implement Debug.

  • The new IndexMap::shrink_to and IndexSet::shrink_to methods shrink the capacity with a lower bound.

  • The new IndexMap::move_index and IndexSet::move_index methods change the position of an item from one index to another, shifting the items between to accommodate the move.

• 1.8.2

  • Bump the rustc-rayon dependency, for compiler use only.

Commits

• a638b99 Merge pull request #233 from cuviper/release-1.9.1
• 3f6cdde Release 1.9.1
• 3f8381a Run CI on 1.56.1 until next hashbrown release
• 24a0c8f Revert "Bump MSRV to 1.56.1, matching hashbrown as of 0.12.1"
• 844750f Fix the RELEASES.md link
• 3222203 Merge pull request #231 from cuviper/release-1.9.0
• 9eda24a Add a release note for move_index
• 8d02160 Use u8 test indices so quickcheck is less likely to go out of bounds.
• be700ef Add move_index to change the position of an entry
• 511280a Add an MSRV note for retain_mut
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 2542856241

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.749%

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Totals
Change from base Build 2067124576:	0.0%
Covered Lines:	53153
Relevant Lines:	63467

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💛 - Coveralls

[dependabot]

Superseded by #18.