Bump version to 1.12.1a1

[oscarbenjamin]

References to other Issues or PRs

This is a hotfix prerelease as a temporary fix for gh-26273

Brief description of what is fixed or changed

Other comments

Release Notes

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This is a hotfix prerelease as a temporary fix for gh-26273

#### Brief description of what is fixed or changed


#### Other comments


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[asmeurer]

Feel free to close #26408 and delete the branch.

[oscarbenjamin]

I think we also need gh-26386

[asmeurer]

We'll definitely want python 3.13 and numpy 2.0 fixes for 1.12.1. I don't know if they are necessary for this quick-fix alpha, but if it doesn't take any extra time to add them I guess it's not a problem.

[oscarbenjamin]

Also included gh-26112

[sympy-bot]

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Hi, I am the SymPy bot. I've noticed that some of your commits add or delete files. Since this is sometimes done unintentionally, I wanted to alert you about it.

This is an experimental feature of SymPy Bot. If you have any feedback on it, please comment at sympy/sympy-bot#75.

The following commits add new files:

• 59650b1:
  • requirements-dev.txt

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[github-actions]

Benchmark results from GitHub Actions

Lower numbers are good, higher numbers are bad. A ratio less than 1
means a speed up and greater than 1 means a slowdown. Green lines
beginning with + are slowdowns (the PR is slower then master or
master is slower than the previous release). Red lines beginning
with - are speedups.

Significantly changed benchmark results (PR vs master)

· Did not find results for commit upstream/master

Significantly changed benchmark results (master vs previous release)

       before           after         ratio
     [41d90958]       [a00718ba]
     <sympy-1.11.1^0>                 
-         768±3μs          475±1μs     0.62  solve.TimeSparseSystem.time_linear_eq_to_matrix(10)
-        2.19±0ms          875±4μs     0.40  solve.TimeSparseSystem.time_linear_eq_to_matrix(20)
-     4.34±0.02ms      1.28±0.01ms     0.30  solve.TimeSparseSystem.time_linear_eq_to_matrix(30)

Full benchmark results can be found as artifacts in GitHub Actions
(click on checks at the top of the PR).

[oscarbenjamin]

Looks like this is working. I expect CI to pass. The generate release files will be in the release workflow and can be uploaded to PyPI.

I'm going to bed though.

[oscarbenjamin]

I'm just running local tests with this before uploading.

[oscarbenjamin]

Also including gh-26269

[oscarbenjamin]

I've just pushed this as 1.12.1a1 to PyPI:
https://pypi.org/project/sympy/#history