Update Rust crate indexmap to v2.12.1 (#16830)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indexmap](https://redirect.github.com/indexmap-rs/indexmap) |
workspace.dependencies | patch | `2.12.0` -> `2.12.1` |

---

### Release Notes

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

###
[`v2.12.1`](https://redirect.github.com/indexmap-rs/indexmap/blob/HEAD/RELEASES.md#2121-2025-11-20)

[Compare
Source](https://redirect.github.com/indexmap-rs/indexmap/compare/2.12.0...2.12.1)

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

</details>

---

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Cargo.lock

@@ -1831,9 +1831,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.16.0"
+version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5419bdc4f6a9207fbeba6d11b604d481addf78ecd10c11ad51e76c2f6482748d"
+checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
 dependencies = [
  "allocator-api2",
  "equivalent",
@@ -2158,12 +2158,12 @@ checksum = "b72ad49b554c1728b1e83254a1b1565aea4161e28dabbfa171fc15fe62299caf"
 
 [[package]]
 name = "indexmap"
-version = "2.12.0"
+version = "2.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6717a8d2a5a929a1a2eb43a12812498ed141a0bcfb7e8f7844fbdbe4303bba9f"
+checksum = "0ad4bb2b565bca0645f4d68c5c9af97fba094e9791da685bf83cb5f3ce74acf2"
 dependencies = [
  "equivalent",
- "hashbrown 0.16.0",
+ "hashbrown 0.16.1",
  "serde",
  "serde_core",
 ]
@@ -6466,7 +6466,7 @@ name = "uv-pypi-types"
 version = "0.0.1"
 dependencies = [
  "anyhow",
- "hashbrown 0.16.0",
+ "hashbrown 0.16.1",
  "indexmap",
  "insta",
  "itertools 0.14.0",
@@ -6646,7 +6646,7 @@ dependencies = [
  "either",
  "fs-err",
  "futures",
- "hashbrown 0.16.0",
+ "hashbrown 0.16.1",
  "indexmap",
  "insta",
  "itertools 0.14.0",