Update Rust crate indexmap to 2.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
indexmap	dependencies	patch	2.2.5 -> 2.2.6

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Release Notes

indexmap-rs/indexmap (indexmap)

### [`v2.2.6`](https://togithub.com/indexmap-rs/indexmap/blob/HEAD/RELEASES.md#226) [Compare Source](https://togithub.com/indexmap-rs/indexmap/compare/2.2.5...2.2.6) - Added trait `MutableValues` for opt-in mutable access to set values.

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Benchmark for be4eb84

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| Test | Base | PR | % | |------|--------------|------------------|---| | Reclass::inventory() multi-threaded | 1637.4±116.53µs | 1634.0±67.26µs | -0.21% | | Reclass::inventory() single-threaded | 3.6±0.03ms | 3.6±0.03ms | 0.00% |