Update dependency mkdocstrings to v0.25.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocstrings (changelog)	==0.25.0 -> ==0.25.1

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Release Notes

mkdocstrings/mkdocstrings (mkdocstrings)

v0.25.1

Compare Source

Compare with 0.25.0

Bug Fixes

• Always descend into sub-headings when re-applying their label (cb86e08 by Timothée Mazzucotelli). Issue-mkdocstrings/python-158

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