fix(deps): update dependency websockets to v15 (#83)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [websockets](https://github.com/python-websockets/websockets) ([changelog](https://websockets.readthedocs.io/en/stable/project/changelog.html)) | project.dependencies | major | `==14.2` -> `==15.0.1` |

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### Release Notes

<details>
<summary>python-websockets/websockets (websockets)</summary>

### [`v15.0.1`](https://github.com/python-websockets/websockets/releases/tag/15.0.1)

[Compare Source](https://github.com/python-websockets/websockets/compare/15.0...15.0.1)

See https://websockets.readthedocs.io/en/stable/project/changelog.html for details.

### [`v15.0`](https://github.com/python-websockets/websockets/releases/tag/15.0)

[Compare Source](https://github.com/python-websockets/websockets/compare/14.2...15.0)

See https://websockets.readthedocs.io/en/stable/project/changelog.html for details.

</details>

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---

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Reviewed-on: #83
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pyproject.toml

@@ -19,7 +19,7 @@ dependencies = [
   "pydantic==2.10.6",
   "red-discordbot==3.5.18",
   "watchdog==6.0.0",
-  "websockets==14.2",
+  "websockets==15.0.1",
 ]
 
 [dependency-groups]