Bump indexmap from 2.2.6 to 2.4.0

[dependabot[bot]]

Bumps indexmap from 2.2.6 to 2.4.0.

Changelog

Sourced from indexmap's changelog.

2.4.0

• Added methods IndexMap::append and IndexSet::append, moving all items from one map or set into another, and leaving the original capacity for reuse.

2.3.0

• Added trait MutableEntryKey for opt-in mutable access to map entry keys.
• Added method MutableKeys::iter_mut2 for opt-in mutable iteration of map keys and values.

Commits

• b66bbfe Merge pull request #337 from cuviper/append
• a288bf3 Add a README note for ordermap
• 0b2b4b9 Release 2.4.0
• 8c0a1cd Add append methods
• 22c0b4e Merge pull request #335 from epage/mut
• 39f7cc0 Release 2.3.0
• 6049d51 feat(map): Add MutableKeys::iter_mut2
• 65c3c46 feat(map): Add MutableEntryKey
• 7f7d39f Merge pull request #332 from waywardmonkeys/missing-indentation-in-doc-comment
• 8222a59 Fix missing indentation in doc comment.
• Additional commits viewable in compare view

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