Update Rust crate indexmap to v2.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
indexmap	dev-dependencies	minor	2.5.0 -> 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.

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[yegor256]

@rultor please, try to merge, since 12 checks have passed

[rultor]

@rultor please, try to merge, since 12 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 12 checks have passed

@yegor256 Done! FYI, the full log is here (took me 22min)