fix(deps): update rust crate indexmap to 2.12.1

[nextest-bot]

This PR contains the following updates:

Package	Type	Update	Change
indexmap	dependencies	minor	2.11.4 -> 2.12.1

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Release Notes

indexmap-rs/indexmap (indexmap)

v2.12.1

Compare Source

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

v2.12.0

Compare Source

• 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.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.26%. Comparing base (a5b73e2) to head (b66c8e9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #506   +/-   ##
=======================================
  Coverage   84.26%   84.26%           
=======================================
  Files           7        7           
  Lines        1856     1856           
=======================================
  Hits         1564     1564           
  Misses        292      292           

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