Pandas 3 support

[freemansw1]

Resolves #561 and adds support for Pandas 3.

With #567 unanswered, I've taken a "middle-ground" approach with datetimes. In several places in the datetime tests, I added us as a valid output. For the matching function, I've updated it to try to force precisions to match.

When you review, please regress changes with and vs Pandas 2.

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[codecov]

Codecov Report

❌ Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 64.95%. Comparing base (8639ece) to head (b08cfbe).
⚠️ Report is 2 commits behind head on RC_v1.6.x.

Files with missing lines	Patch %	Lines
tobac/utils/datetime.py	96.15%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           RC_v1.6.x     #568      +/-   ##
=============================================
+ Coverage      64.86%   64.95%   +0.09%     
=============================================
  Files             27       27              
  Lines           4047     4066      +19     
=============================================
+ Hits            2625     2641      +16     
- Misses          1422     1425       +3     

Flag	Coverage Δ
unittests	64.95% <96.96%> (+0.09%)	⬆️

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[github-actions]

Linting results by Pylint:

Your code has been rated at 8.36/10 (previous run: 8.37/10, -0.01)
_{The linting score is an indicator that reflects how well your code version follows Pylint’s coding standards and quality metrics with respect to the RC_v1.6.x branch.
A decrease usually indicates your new code does not fully meet style guidelines or has potential errors.}

[freemansw1]

@w-k-jones or @kelcyno are you up to review here?

[w-k-jones]

I had a quick look through and everything looks good, my only request would be that you add a test for the exception in detect_str_precision (line 197) to reach 100% test coverage 😁