`icon_path` expects `Unicode()` in recent `jupyter-proxy-server`-code

[jhgoebbert]

Summary

Recent commits (Dez 2024) of jupyter_server_proxy introduced more checks:
https://github.com/jupyterhub/jupyter-server-proxy/pull/507/files#diff-903467c33ed562fa960d8c2a468d97b64e196aa6434eb5ad8aa3e174ff7c8217R44
and now fail with the following:

[W 2025-10-21 13:09:15.395 ServerApp] jupyter_server_proxy | extension failed loading with message: TraitError("The 'icon_path' trait of a LauncherEntry instance expected a unicode string, not the PosixPath PosixPath('/p/software/default/stages/2025/software/JupyterProxy-Matlab/0.17.1-GCCcore-13.3.0/lib/python3.12/site-packages/jupyter_matlab_proxy/icon_open_matlab.svg').")

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