chore(deps): update pre-commit hook kynan/nbstripout to v0.8.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
kynan/nbstripout	repository	minor	0.7.1 -> 0.8.1

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Release Notes

kynan/nbstripout (kynan/nbstripout)

v0.8.1

Compare Source

• In dry run mode, only print output if there would have been a change (#​152).
• Declare git filter to be required when installing, such that it must
  succeed (#​191).

v0.8.0

Compare Source

• Adds --verify flag, similar to --dry-run but returning 1 if any
  affected files would have changed (@​jspaezp, #​153, #​195).
• Adds script to apply nbstripout retroactively using git-filter-repo to
  README (@​LunarLanding @​tokleine, #​194 #​197).
• Documents nbstripout on all files in the current directory and
  subdirectories recursively (#​127).
• Accepts notebooks without nbformat version specified.
• Improves test coverage.

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