Add importlib_metadata to Sphinx's dependencies

[jhpalmieri]

Right now ./configure && make sphinx finishes successfully, but the sphinx log file says

ERROR: Could not find a version that satisfies the requirement importlib-metadata>=4.4; python_version < "3.10" (from sphinx) (from versions: none)
ERROR: No matching distribution found for importlib-metadata>=4.4; python_version < "3.10"

We can fix this by adding importlib_metadata to the sphinx/dependencies file.

Component: packages: standard

Author: John Palmieri

Branch/Commit: 95c79ab

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/34200

[jhpalmieri]

Branch: u/jhpalmieri/sphinx-dependencies

[mkoeppe]

Commit: d54140e

[mkoeppe]

comment:2

I think six can be removed - it no longer appears in https://github.com/sphinx-doc/sphinx/blob/v4.4.0/setup.py (install_requires)

---

New commits:

d54140e

trac 34200: add importlib_metadata to build/pkgs/sphinx/dependencies

[jhpalmieri]

comment:3

sphinx builds without six and doesn't report any errors, so let's remove that, too.

[sagetrac-git]

Changed commit from d54140e to 95c79ab

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

95c79ab

trac 34200: add importlib_metadata to and remove six from

[mkoeppe]

Reviewer: Matthias Koeppe

[jhpalmieri]

comment:7

Thanks! I think we can also remove six from a few other dependencies: cycler, prompt_toolkit, and traitlets. But we're far from being able to excise it altogether since lots of other packages require it.

[vbraun]

Changed branch from u/jhpalmieri/sphinx-dependencies to 95c79ab