Test against pycrdt-websocket v0.16.0 & update dev dependencies

[krassowski]

Closes #333

[krassowski]

The documentation build failure is due to lib0 typing issues:

> @jupyter/[email protected] build /home/docs/checkouts/readthedocs.org/user_builds/jupyter-ydoc/checkouts/339/javascript
> tsc -b
node_modules/lib0/encoding.d.ts(6,11): error TS2315: Type 'Uint8Array' is not generic.
node_modules/lib0/encoding.d.ts(13,53): error TS2315: Type 'Uint8Array' is not generic.
node_modules/lib0/encoding.d.ts(146,21): error TS2315: Type 'Uint8Array' is not generic.
node_modules/lib0/encoding.d.ts(172,21): error TS2315: Type 'Uint8Array' is not generic.
node_modules/lib0/encoding.d.ts(208,21): error TS2315: Type 'Uint8Array' is not generic.
node_modules/lib0/encoding.d.ts(231,21): error TS2315: Type 'Uint8Array' is not generic.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @jupyter/[email protected] build: `tsc -b`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @jupyter/[email protected] build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/docs/.npm/_logs/2025-08-27T15_26_51_710Z-debug.log
Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/jupyter-ydoc/envs/339/lib/python3.8/site-packages/sphinx/cmd/build.py", line 285, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/home/docs/checkouts/readthedocs.org/user_builds/jupyter-ydoc/envs/339/lib/python3.8/site-packages/sphinx/application.py", line 243, in __init__
    self.config.setup(self)
  File "/home/docs/checkouts/readthedocs.org/user_builds/jupyter-ydoc/checkouts/339/docs/source/conf.py", line 92, in setup
    check_call(cmd + ["run", "build"], cwd=str(js))
  File "/home/docs/.asdf/installs/python/3.8.20/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['npm', 'run', 'build']' returned non-zero exit status 1.
Exception occurred:
  File "/home/docs/.asdf/installs/python/3.8.20/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['npm', 'run', 'build']' returned non-zero exit status 1.

We need to upgrade typescript as in jupyterlab/extension-template#107