Bump indexmap from 2.12.0 to 2.14.0

[dependabot]

Bumps indexmap from 2.12.0 to 2.14.0.

Changelog

Sourced from indexmap's changelog.

2.14.0 (2026-04-09)

• MSRV: Rust 1.85.0 or later is now required.
• Updated the hashbrown dependency to 0.17.
• Made more map::Slice methods const: new_mut, first_mut, last_mut, split_at_mut, split_at_mut_checked, split_first_mut, split_last_mut

2.13.1 (2026-04-02)

• Made some Slice methods const:
  • map::Slice::{first,last,split_at,split_at_checked,split_first,split_last}
  • set::Slice::{first,last,split_at,split_at_checked,split_first,split_last}

2.13.0 (2026-01-07)

• Implemented Clone for IntoKeys and IntoValues.
• Added map::Slice::split_at_checked and split_at_mut_checked.
• Added set::Slice::split_at_checked.

2.12.1 (2025-11-20)

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

Commits

• bcd165b Merge pull request #439 from cuviper/release-2.14.0
• 4ef06a7 Release 2.14.0
• d21826c Merge pull request #438 from cuviper/hashbrown-0.17
• 2566bec Upgrade to hashbrown v0.17
• 4b62776 Merge pull request #437 from cuviper/disjoint-panic
• 478fba2 Normalize the panic doc of get_disjoint_mut
• fb6dafd Merge pull request #436 from cuviper/const-slice-mut
• 5c237a2 Make Slice::{first,last,split_*}_mut methods const
• 48ff9ce Merge pull request #435 from cuviper/edition-2024
• 648be98 cargo fmt with edition 2024
• Additional commits viewable in compare view