Update Rust crate indexmap to v2.7.0 (#30)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indexmap](https://redirect.github.com/indexmap-rs/indexmap) |
dependencies | minor | `2.6.0` -> `2.7.0` |

---

### Release Notes

<details>
<summary>indexmap-rs/indexmap (indexmap)</summary>

###
[`v2.7.0`](https://redirect.github.com/indexmap-rs/indexmap/blob/HEAD/RELEASES.md#270-2024-11-30)

[Compare
Source](https://redirect.github.com/indexmap-rs/indexmap/compare/2.6.0...2.7.0)

- Added methods `Entry::insert_entry` and `VacantEntry::insert_entry`,
returning
    an `OccupiedEntry` after insertion.

</details>

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