Update Rust crate once_cell to 1.18.0 (#1932)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [once_cell](https://github.com/matklad/once_cell) | dependencies | minor | `1.17.1` -> `1.18.0` |

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### Release Notes

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

### [`v1.18.0`](https://github.com/matklad/once_cell/blob/HEAD/CHANGELOG.md#&#8203;1180)

[Compare Source](matklad/once_cell@v1.17.2...v1.18.0)

-   `MSRV` is updated to 1.60.0 to take advantage of `dep:` syntax for cargo features,
    removing "implementation details" from publicly visible surface.

### [`v1.17.2`](https://github.com/matklad/once_cell/blob/HEAD/CHANGELOG.md#&#8203;1172)

[Compare Source](matklad/once_cell@v1.17.1...v1.17.2)

-   Avoid unnecessary synchronization in `Lazy::{force,deref}_mut()`, [#&#8203;231](matklad/once_cell#231).

</details>

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---

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Co-authored-by: cabr2-bot <cabr2.help@gmail.com>
Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1932
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>
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webserver/Cargo.toml

@@ -19,7 +19,7 @@ tokio = { version = "1.28.2", features = ["macros", "rt-multi-thread"] }
 uuid = { version = "1.3.3", features = ["v4"] }
 warp = { version = "0.3.5", default-features = false, features = ["compression"] }
 structopt = "0.3.26"
-once_cell = "1.17.1"
+once_cell = "1.18.0"
 
 config = { path = "../crates/config/", features = [ "webserver" ]}
 load_save = { path = "../crates/load_save/" }