Update Rust crate once_cell to 1.12.1 (#1447)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [once_cell](https://github.com/matklad/once_cell) | dependencies | patch | `1.12.0` -> `1.12.1` |

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### Release Notes

<details>
<summary>matklad/once_cell</summary>

### [`v1.12.1`](https://github.com/matklad/once_cell/blob/HEAD/CHANGELOG.md#&#8203;1121)

[Compare Source](matklad/once_cell@v1.12.0...v1.12.1)

-   Remove incorrect `debug_assert`.

</details>

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Co-authored-by: cabr2-bot <cabr2.help@gmail.com>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1447
Reviewed-by: 6543 <6543@noreply.codeberg.org>
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webserver/Cargo.toml

@@ -24,7 +24,7 @@ types = { path = "../crates/types/" }
 uuid = { version = "1.1.2", features = ["serde", "v4"] }
 warp = "0.3.2"
 structopt = "0.3.26"
-once_cell = "1.12.0"
+once_cell = "1.12.1"
 
 [features]
 portable = [ "config/portable" ]