python -m pip install warns about non proper HTML 5 document

[Apollo3zehn]

When I run python -m pip install --pre --index-url https://www.myget.org/F/apollo3zehn-dev/python/ -r "requirements.txt" --disable-pip-version-check (with a requirements.txt content of nexus-remoting~=1.0.0b12136) I get the following warning on Kubuntu 22.04:

DEPRECATION: The HTML index page being used (https://www.myget.org/F/apollo3zehn-dev/python/nexus-remoting/) is not a proper HTML 5 document. This is in violation of PEP 503 which requires these pages to be well-formed HTML 5 documents. Please reach out to the owners of this index page, and ask them to update this index page to a valid HTML 5 document. pip 22.2 will enforce this behaviour change. Discussion can be found at https://github.com/pypa/pip/issues/10825

[Apollo3zehn]

It looks like this in a Jupyter Notebook:

[Apollo3zehn]

@maartenba, @xavierdecoster

Could you please have a look into this, otherwise I fear restoring Python packages won't be possible anymore soon. Thank you!