fix(deps): update rust crate indexmap to 2.12.1

[mend-5034428]

This PR contains the following updates:

Package	Type	Update	Change
indexmap	dependencies	minor	2.7 -> 2.12.1

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Release Notes

indexmap-rs/indexmap (indexmap)

v2.12.1

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• Simplified a lot of internals using hashbrown's new bucket API.

v2.12.0

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• MSRV: Rust 1.82.0 or later is now required.
• Updated the hashbrown dependency to 0.16 alone.
• Error types now implement core::error::Error.
• Added pop_if methods to IndexMap and IndexSet, similar to the
  method for Vec added in Rust 1.86.

v2.11.4

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• Updated the hashbrown dependency to a range allowing 0.15 or 0.16.

v2.11.3

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• Make the minimum serde version only apply when "serde" is enabled.

v2.11.2

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• Switched the "serde" feature to depend on serde_core, improving build
  parallelism in cases where other dependents have enabled "serde/derive".

v2.11.1

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• Added a get_key_value_mut method to IndexMap.
• Removed the unnecessary Ord bound on insert_sorted_by methods.

v2.11.0

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• Added insert_sorted_by and insert_sorted_by_key methods to IndexMap,
  IndexSet, and VacantEntry, like customizable versions of insert_sorted.
• Added is_sorted, is_sorted_by, and is_sorted_by_key methods to
  IndexMap and IndexSet, as well as their Slice counterparts.
• Added sort_by_key and sort_unstable_by_key methods to IndexMap and
  IndexSet, as well as parallel counterparts.
• Added replace_index methods to IndexMap, IndexSet, and VacantEntry
  to replace the key (or set value) at a given index.
• Added optional sval serialization support.

v2.10.0

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• Added extract_if methods to IndexMap and IndexSet, similar to the
  methods for HashMap and HashSet with ranges like Vec::extract_if.
• Added more #[track_caller] annotations to functions that may panic.

v2.9.0

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• Added a get_disjoint_mut method to IndexMap, matching Rust 1.86's
  HashMap method.
• Added a get_disjoint_indices_mut method to IndexMap and map::Slice,
  matching Rust 1.86's get_disjoint_mut method on slices.
• Deprecated the borsh feature in favor of their own indexmap feature,
  solving a cyclic dependency that occurred via borsh-derive.

v2.8.0

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• Added indexmap_with_default! and indexset_with_default! to be used with
  alternative hashers, especially when using the crate without std.
• Implemented PartialEq between each Slice and []/arrays.
• Removed the internal rustc-rayon feature and dependency.

v2.7.1

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• Added #[track_caller] to functions that may panic.
• Improved memory reservation for insert_entry.

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