Update dependency blacken-docs to v1.19.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
blacken-docs (changelog)	1.19.0 -> 1.19.1

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Release Notes

asottile/blacken-docs (blacken-docs)

v1.19.1

Compare Source

• Add support for Black's --pyi flag.

  Thanks to Alex Waygood in PR #&#8203;375 <https://github.com/adamchainz/blacken-docs/pull/375>__.

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.36%. Comparing base (4bf9c56) to head (c2680dc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #625   +/-   ##
=======================================
  Coverage   94.36%   94.36%           
=======================================
  Files           9        9           
  Lines         870      870           
  Branches      121      121           
=======================================
  Hits          821      821           
  Misses         22       22           
  Partials       27       27           

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