Add pre-commit-ci

[juanitorduz]

This PR suggests using pre-commit-ci (https://pre-commit.ci/) so that the versions of the pre-commit hooks get automatically updated weekly. If any package needs an update, a pre-commit PR will be opened every week. This is much better than doing it by hand and ensuring the lint and code style do not break without warning. Here is an example of such PR from one of my projects: pymc-labs/pymc-marketing#642

Once (and if) this PR is merged, @s3alfisc you need to sign up with GitHub and approve the integration of the pre-commit app here: https://pre-commit.ci/

Important: pre-commit.ci will always be free for open source repositories. (from the documentation)

[juanitorduz]

The test fails (3.11) from https://github.com/s3alfisc/pyfixest/actions/runs/8837489162/job/24266463332?pr=375 has nothing to do with this change. Maybe you can try to re-run the job?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.90%. Comparing base (35b47e9) to head (e2f9e3a).
Report is 43 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
- Coverage   85.79%   81.90%   -3.89%     
==========================================
  Files          38       53      +15     
  Lines        3421     4178     +757     
==========================================
+ Hits         2935     3422     +487     
- Misses        486      756     +270     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[s3alfisc]

Thank you, this will be very useful =)

[s3alfisc]

& permission granted 🎉