Treat deprecations seriously - deprecation in websockets (zauberzeug#5256)

### Motivation

https://websockets.readthedocs.io/en/stable/howto/upgrade.html, and we
have 5 years to migrate.

The deadline is 2030 so we're 5 years early, but I guess that's better
than being late (🤡).

### Implementation

WebSocket protocol configuration:

* Sets the `ws` parameter to `'wsproto'` when configuring the Uvicorn
server in `nicegui/ui_run.py`
* We can choose anything but `auto` (defaults to the websockets legacy)
and `websockets`
* **Personally believe** that by using `wsproto`, which is more
low-level, we may have performance increase.
  * But we may use `websockets-sansio` as well. 

Test configuration cleanup:

* Removes deprecated warning filters related to the `websockets.legacy`
and `uvicorn.protocols.websockets` modules from the `filterwarnings`
section in `pyproject.toml`, as these are no longer needed.

### Progress

- [x] I chose a meaningful title that completes the sentence: "If
applied, this PR will..."
- [x] The implementation is complete.
- [x] Pytests have been added (or are not necessary).
- [x] Documentation has been added (or is not necessary).

Author: evnchn

nicegui/ui_run.py

@@ -250,6 +250,7 @@ def split_args(args: str) -> list[str]:
         reload_excludes=split_args(uvicorn_reload_excludes) if reload else None,
         reload_dirs=split_args(uvicorn_reload_dirs) if reload else None,
         log_level=uvicorn_logging_level,
+        ws='wsproto',
         **kwargs,
     )
     config.storage_secret = storage_secret

pyproject.toml

@@ -95,8 +95,6 @@ main_file = ""
 testpaths = ["tests"]
 filterwarnings = [
   'error',
-  'ignore::DeprecationWarning:^websockets\.legacy(\.|$)',
-  'ignore::DeprecationWarning:^uvicorn\.protocols\.websockets(\.|$)',
   "ignore:'asyncio\\.iscoroutinefunction' is deprecated and slated for removal:DeprecationWarning",
 ]