Update Rust crate indexmap to v2.13.0 (#17591)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indexmap](https://redirect.github.com/indexmap-rs/indexmap) |
workspace.dependencies | minor | `2.12.1` → `2.13.0` |

---

### Release Notes

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

###
[`v2.13.0`](https://redirect.github.com/indexmap-rs/indexmap/blob/HEAD/RELEASES.md#2130-2026-01-07)

[Compare
Source](https://redirect.github.com/indexmap-rs/indexmap/compare/2.12.1...2.13.0)

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

</details>

---

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Cargo.lock

@@ -2255,9 +2255,9 @@ checksum = "09e54e57b4c48b40f7aec75635392b12b3421fa26fe8b4332e63138ed278459c"
 
 [[package]]
 name = "indexmap"
-version = "2.12.1"
+version = "2.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ad4bb2b565bca0645f4d68c5c9af97fba094e9791da685bf83cb5f3ce74acf2"
+checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
 dependencies = [
  "equivalent",
  "hashbrown 0.16.1",