increment frank version

[jeffjennings]

This PR:

• sets up a new release (after someone was trying to use the pip version of frank and encountered a bug that we fixed after the last release)
• bumps the python versions to drop support for 3.7 and add support for 3.12 (https://devguide.python.org/versions/)
  - bumps the minimum scipy version from 1.2.0 to 1.7.0 (current version is 1.14.0) [instead using scipy versions set in Fix scipy nnls issue #223]
• sets the tests workflow to run once a week (in addition to still running on all pushes)

Tests will fail until #222 is addressed. HISTORY.rst should be updated here after that's fixed. This should also wait on #221 [Done]

[rbooth200]

I think we should fix #222 before merging this one though.

[jeffjennings]

Ok I updated the changelog with our changes in the last couple days. I'll wait to merge this and release a new version until #224 and #225 are merged.