skip check-manifest in pre-commit.ci

[graingert]

Remove this paragraph

Please have a look at our dev docs before submitting your PR: https://github.com/twisted/ldaptor/blob/master/CONTRIBUTING.rst

Contributor Checklist:

• [ ] I have updated the release notes at docs/source/NEWS.rst
• [ ] I have updated the automated tests.
• [ ] All tests pass on your local dev environment. See CONTRIBUTING.rst.

[codecov[bot]]

Codecov Report

Merging #229 (e7e69aa) into master (259c874) will not change coverage. The diff coverage is n/a.

:exclamation: Current head e7e69aa differs from pull request most recent head 281b49f. Consider uploading reports for the commit 281b49f to get more accurate results

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   83.28%   83.28%           
=======================================
  Files          87       87           
  Lines       11567    11567           
  Branches     1184     1184           
=======================================
  Hits         9634     9634           
  Misses       1815     1815           
  Partials      118      118           

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