Add support for python 3.13

[d-chambers]

Description

This PR adds support for python 3.13. Although currently two of our optional dependencies don't support python 3.13 (numba and segyio). It should at least allow users to get most of DASCore's functionality until these libraries catch up. For now, we can just run py3.13 on the min_deps tests.

Also fixed a test to account for docstrings automatically having their white space stripped and added optional deps to the doc build since some docstrings will require them.

Checklist

I have (if applicable):

• referenced the GitHub issue this PR closes.
• documented the new feature with docstrings or appropriate doc page.
• included a test. See testing guidelines.
• your name has been added to the contributors page (docs/contributors.md).
• added the "ready_for_review" tag once the PR is ready to be reviewed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (df47d0e) to head (29824fd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #473   +/-   ##
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  Coverage   99.85%   99.85%           
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  Files         115      115           
  Lines        9507     9507           
=======================================
  Hits         9493     9493           
  Misses         14       14           

Flag	Coverage Δ
unittests	99.85% <ø> (ø)

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