Python 3.13: Account for dedented docstrings

[penguinpee]

• Dedent docstrings in Python 3.13+
• Fix #1311
• Ref: https://github.com/python/cpython/issues/81283

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 92.23%. Comparing base (e5cd0e8) to head (9fa116b).

Files	Patch %	Lines
nibabel/deprecator.py	42.85%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1315 +/- ## ========================================== - Coverage 92.26% 92.23% -0.03% ========================================== Files 99 99 Lines 12472 12479 +7 Branches 2566 2568 +2 ========================================== + Hits 11507 11510 +3 - Misses 642 645 +3 - Partials 323 324 +1 ```

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[effigies]

This looks good. Would you mind building the docs with 3.13 and taking a screenshot of a deprecated function? onetime.setattr_on_read should work.

[penguinpee]

Well, this was a painful ask seeing that the top level Makefile still references setup.py which has been removed more than a year ago. It even calls sutup.py build. Ouch!

Anyway, I hope this is what you were asking for:

If not, let me know. I have the entire HTML docs build with Python 3.13 available now.

[effigies]

Sorry, I always use make -C doc html, so I don't often notice problems in the top-level Makefile.

Thanks for going to the effort, that looks good to me.

[penguinpee]

Sorry, I always use make -C doc html, so I don't often notice problems in the top-level Makefile.

Well, I was just following the instructions. PR #1316 will make sure other users like me have a less painful experience.