fix(deps): update rust crate indexmap to 2.7.1 (#381)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [indexmap](https://redirect.github.com/indexmap-rs/indexmap) |
dependencies | patch | `2.7.0` -> `2.7.1` |

---

### Release Notes

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

###
[`v2.7.1`](https://redirect.github.com/indexmap-rs/indexmap/blob/HEAD/RELEASES.md#271-2025-01-19)

[Compare
Source](https://redirect.github.com/indexmap-rs/indexmap/compare/2.7.0...2.7.1)

-   Added `#[track_caller]` to functions that may panic.
-   Improved memory reservation for `insert_entry`.

</details>

---

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guppy/Cargo.toml

@@ -37,7 +37,7 @@ debug-ignore = "1.0.5"
 guppy-summaries = { version = "0.7.1", path = "../guppy-summaries", optional = true }
 fixedbitset = { version = "0.4.2", default-features = false }
 nested = "0.1.1"
-indexmap = "2.7.0"
+indexmap = "2.7.1"
 itertools = "0.14.0"
 once_cell = "1.20.2"
 pathdiff = { version = "0.2.3", features = ["camino"] }