Fix up pint 0.21 and re-enable tests

[coroa]

Adds the full name of DataFrame to upcast_type_map (as a backport of https://github.com/hgrecco/pint/pull/1777) and re-enables most tests marked xfail in #168, except for the groupby with extension arrays one, which still fails with pandas>=2.0, until one of #172, #176 or #178 is in.

• [ ] ~Closes # (insert issue number)~ Issues are already closed
• [x] Executed pre-commit run --all-files with no errors
• [x] The change is fully covered by automated unit tests
• [ ] ~Documented in docs/ as appropriate~
• [x] Added an entry to the CHANGES file

[andrewgsavage]

bors r+

[bors[bot]]

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here. For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

• ci
• lint