fix(deps): update rust crate indexmap to v2.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
indexmap	dependencies	minor	2.4.0 -> 2.6.0

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Release Notes

indexmap-rs/indexmap (indexmap)

v2.6.0

Compare Source

• Implemented Clone for map::IntoIter and set::IntoIter.
• Updated the hashbrown dependency to version 0.15.

v2.5.0

Compare Source

• Added an insert_before method to IndexMap and IndexSet, as an
  alternative to shift_insert with different behavior on existing entries.
• Added first_entry and last_entry methods to IndexMap.
• Added From implementations between IndexedEntry and OccupiedEntry.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.63%. Comparing base (36b4a12) to head (4a1ddb4).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   55.60%   55.63%   +0.03%     
==========================================
  Files          56       56              
  Lines       11455    11455              
==========================================
+ Hits         6369     6373       +4     
+ Misses       5086     5082       -4     

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