Update Rust crate blake3 to v1.6.1 (#26159)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [blake3](https://redirect.github.com/BLAKE3-team/BLAKE3) |
workspace.dependencies | patch | `1.6.0` -> `1.6.1` |

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### Release Notes

<details>
<summary>BLAKE3-team/BLAKE3 (blake3)</summary>

###
[`v1.6.1`](https://redirect.github.com/BLAKE3-team/BLAKE3/releases/tag/1.6.1)

[Compare
Source](https://redirect.github.com/BLAKE3-team/BLAKE3/compare/1.6.0...1.6.1)

version 1.6.1

Changes since 1.6.0:

-   Remove `mmap` from the default features list. It was added
    accidentally in v1.6.0, last week. This is technically a
backwards-incompatible change, but I would rather not tag v2.0.0 for a
    build-time bugfix with a simple workaround.

</details>

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---

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Release Notes:

- N/A

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