build: Add support for python 3.14 and drop for python 3.11

[stevenhua0320]

@sbillinge ready to review, Closes #360

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (64ad577) to head (ed72aca).
⚠️ Report is 6 commits behind head on v3.7.0.

Additional details and impacted files

@@            Coverage Diff            @@
##            v3.7.0      #374   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          520       516    -4     
=========================================
- Hits           520       516    -4     

see 1 file with indirect coverage changes

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[sbillinge]

Thanks @stevenhua0320 this is great. Do we have a checklist of things to check for this migration? It would be good if we did. For example, did you search the docs (and all the project tbh) for mentions of 3.13 and 3.11? To minimize maintenance we try and remove too much version specific things, but still, a checklist of things we check for this task would be good, and then a comment in the PR that the checklist was completed would be good. Can I put you in charge of that? Thanks so much.

[stevenhua0320]

Thanks @stevenhua0320 this is great. Do we have a checklist of things to check for this migration? It would be good if we did. For example, did you search the docs (and all the project tbh) for mentions of 3.13 and 3.11? To minimize maintenance we try and remove too much version specific things, but still, a checklist of things we check for this task would be good, and then a comment in the PR that the checklist was completed would be good. Can I put you in charge of that? Thanks so much.

I think Caden has done most of the job summarizing how we will do the migration. For general thing for each package, we need to edit the pyproject.toml for new version. Since we might mention the version elsewhere in some packages, and the location might not be the same for each package, Caden proposed to use global search to find anything left with old version. I have done that for diffpy.utils and confirmed that we did not mention the python version related things elsewhere for this package.