Bump indexmap from 2.2.3 to 2.2.6

[dependabot[bot]]

Bumps indexmap from 2.2.3 to 2.2.6.

Changelog

Sourced from indexmap's changelog.

2.2.6

• Added trait MutableValues for opt-in mutable access to set values.

2.2.5

• Added optional borsh serialization support.

2.2.4

• Added an insert_sorted method on IndexMap, IndexSet, and VacantEntry.
• Avoid hashing for lookups in single-entry maps.
• Limit preallocated memory in serde deserializers.

Commits

• 3f0fffb Merge pull request #323 from cuviper/mutable
• 33c1a7c Fix unused_imports
• b76ff73 Fix clippy::multiple_bound_locations
• 0060546 Release 2.2.6
• 210b027 Opt-in mutable access on IndexSet
• 184fe4b Merge pull request #320 from cuviper/release-2.2.5
• 5d7bd5e Release 2.2.5
• c934ace Merge pull request #313 from heliaxdev/heliax/borsh-support
• b81a4d2 Use S for the BuildHasher parameter
• 32793f1 Don't require BuildHasher in BorshSerialize
• Additional commits viewable in compare view

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