Add Python 3.13 Support

[ni-jfitzger]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicable.
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

1. Adds official Python 3.13 support to nimi-python through testing.
   The version of Python used by readthedocs for documentation generation remains unchanged at 3.11. I prefer to be intentional about changes to the generation of documentation.

2. Update grpcio, protobuf deps for Python 3.13 compatibility

Initially attempted codegen with Python 3.13 and chose grpcio, protobuf versions for compatibility with the newer grpcio-tools version. We decided to continue generating pb2 files with Python 3.12 to avoid breaking compatibility with other NI Python packages. See this discussion. Afterward, I kept the grpcio, protobuf versions in our tox .inis because I knew they were compatible with Python 3.13 and can be used if/when we begin code-generating with Python 3.13.

grpcio-tools compatibility for version 1.67.0 (The earliest version with a 3.13 wheel)

Due to generating with the same grpcio-tools version as before, I had to disable the ensure_codegen_up_to_date check on Python 3.13, though it still runs on the other versions.

List issues fixed by this Pull Request below, if any.

• Fix Add Python 3.13 support and loosen protobuf version constraint #2075

What testing has been done?

PR Checks

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (dd57eae) to head (d02180c).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2080      +/-   ##
==========================================
- Coverage   91.33%   91.32%   -0.02%     
==========================================
  Files          66       66              
  Lines       16274    16274              
==========================================
- Hits        14864    14862       -2     
- Misses       1410     1412       +2     

Flag	Coverage Δ
codegenunittests	84.95% <ø> (ø)
nidcpowersystemtests	94.59% <ø> (+0.04%)	⬆️
nidcpowerunittests	89.53% <ø> (ø)
nidigitalsystemtests	92.20% <ø> (ø)
nidigitalunittests	68.45% <ø> (ø)
nidmmsystemtests	92.72% <ø> (ø)
nifakeunittests	86.98% <ø> (-0.26%)	⬇️
nifgensystemtests	94.86% <ø> (ø)
nimodinstsystemtests	73.85% <ø> (ø)
nimodinstunittests	94.20% <ø> (ø)
niscopesystemtests	92.94% <ø> (ø)
niscopeunittests	43.20% <ø> (ø)
nisesystemtests	91.50% <ø> (ø)
niswitchsystemtests	82.03% <ø> (ø)
nitclksystemtests	94.87% <ø> (ø)
nitclkunittests	98.26% <ø> (ø)

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see 2 files with indirect coverage changes

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[ni-jfitzger]

A crash in a test?

Windows fatal exception: code 0xe0434f4e
... File "C:\ar_work\nimi-python\nimi-python\src\nidigital\system_tests\test_system_nidigital.py", line 1245 in test_specifications_levels_and_timing_multiple

https://github.com/ni/nimi-python/actions/runs/13359250170/job/37306365454

[bkeryan]

Approved with suggestions

[ni-jfitzger]

@marcoskirsch
This is tested and has approvals from Brad and Tobias, so I'm submitting it without further review to avoid taking up your time.
There are no API changes, so it's less important to have your scrutiny.