Update Rust crate heed to v0.20.3 (zed-industries#15169)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [heed](https://togithub.com/Kerollmops/heed) | workspace.dependencies
| patch | `0.20.1` -> `0.20.3` |

---

### Release Notes

<details>
<summary>Kerollmops/heed (heed)</summary>

###
[`v0.20.3`](https://togithub.com/meilisearch/heed/releases/tag/v0.20.3):
🛁

[Compare
Source](https://togithub.com/Kerollmops/heed/compare/v0.20.2...v0.20.3)

<p align="center"><img width="280px"
src="https://raw.githubusercontent.com/meilisearch/heed/main/assets/heed-pigeon-logo.png"></a></p>
<h1 align="center" >heed</h1>

##### What's Changed
* Update dependencies by
@&zed-industries#8203;irevoi[https://github.com/meilisearch/heed/pull/265](https://togithub.com/meilisearch/heed/pull/265)ll/265

###
[`v0.20.2`](https://togithub.com/meilisearch/heed/releases/tag/v0.20.2):
🛁

[Compare
Source](https://togithub.com/Kerollmops/heed/compare/v0.20.1...v0.20.2)

<p align="center"><img width="280px"
src="https://raw.githubusercontent.com/meilisearch/heed/main/assets/heed-pigeon-logo.png"></a></p>
<h1 align="center" >heed</h1>

##### What's Changed
* Introduce the `longer-keys` feature which sets `-DMDB_MAXKEYSIZE=0` by
@&zed-industries#8203;tpund[https://github.com/meilisearch/heed/pull/263](https://togithub.com/meilisearch/heed/pull/263)ll/263
* Bump the internal LMDB version to v0.9.33 by
@&zed-industries#8203;Kerollmo[https://github.com/meilisearch/heed/pull/264](https://togithub.com/meilisearch/heed/pull/264)ll/264

##### New Contributors
* @&zed-industries#8203;tpunder made their first
contributi[https://github.com/meilisearch/heed/pull/263](https://togithub.com/meilisearch/heed/pull/263)ll/263

</details>

---

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---

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---

Release Notes:

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