Migrate to mamba-org/setup-micromamba

[d-watt]

• Closes replace provision-with-micromamba #1746
• I am familiar with the contributing guidelines
• Pull request is nearly complete and ready for detailed review.
• Maintainer: Appropriate GitHub Labels (including remote-data) and Milestone are assigned to the Pull Request and linked Issue.

Migrating to mamba-org/setup-micromamba, as outlined in #1746

[d-watt]

@wholmgren since it's my first pvlib pr, looks like some workflows require approval to trigger? I've taken a shot at addressing #1758, ready to review!

[kandersolar]

Looks good to me, thanks @d-watt! Can you also make a brief note under Testing and add yourself to the contributors list in https://github.com/pvlib/pvlib-python/blob/main/docs/sphinx/source/whatsnew/v0.9.6.rst?

[d-watt]

Thanks @kandersolar! Missed that in the contributing guidelines. Ready to re-review.
*er, hold on, will re-mention. I see the docs build failing.

Looks good to me, thanks @d-watt! Can you also make a brief note under Testing and add yourself to the contributors list in https://github.com/pvlib/pvlib-python/blob/main/docs/sphinx/source/whatsnew/v0.9.6.rst?

[d-watt]

Alright @kandersolar, ready for another look!

[kandersolar]

LGTM. Thanks @d-watt!

[wholmgren]

Thanks @d-watt and @kandersolar!