Release v0.19.4

[Conengmo]

The Timeline plugin is broken in the current release. We merged a fix, but we can't directly do a patch release from our main branch, because we have other new features in there as well. I made a separate branch of the previous release with just the fix cherry-picked in there.

@hansthen could you check if this draft release seems good? https://github.com/python-visualization/folium/releases/tag/untagged-5adf075cbfd092de5097

After the release, we can merge commit this branch into main, so we preserve the release tag: https://github.com/python-visualization/folium/tree/release-v0.19.4

[hansthen]

I don't see an issue with this.

[Conengmo]

Thanks! I did the release, hopefully the last patch release on v0.19 :)