Sync vendored version of more_itertools between setuptools and pkg_resources

[abravalheri]

I added this (more_itertools) here because it was listed in pkg_resources.extern.names.
The version corresponds to the version that already exists in the pkg_resources/_vendor the directory... But that is different from the version in setuptools/_vendor/vendored.txt. Maybe we should synchronise these versions so that it makes the life easier for downstream packagers "de-vendoring" setuptools?

Originally posted by @abravalheri in #4320 (comment)

Potentially other packages too.

[mgorny]

For the record, downstream packagers don't pin versions to whatever was vendored. That would be completely unmaintainable.

[Avasam]

This should already be resolved now that there's a single _vendor folder right ?

[jaraco]

This should already be resolved now that there's a single _vendor folder right ?

Yes, I think so.