Update dependency black to v26.3.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
black (changelog)	26.3.0 → 26.3.1

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Release Notes

psf/black (black)

v26.3.1

Compare Source

Stable style

• Prevent Jupyter notebook magic masking collisions from corrupting cells by using
  exact-length placeholders for short magics and aborting if a placeholder can no longer
  be unmasked safely (#​5038)

Configuration

• Always hash cache filename components derived from --python-cell-magics so custom
  magic names cannot affect cache paths (#​5038)

Blackd

• Disable browser-originated requests by default, add configurable origin allowlisting
  and request body limits, and bound executor submissions to improve backpressure
  (#​5039)

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