Update pre-commit hooks and fix CSV data value

[drbenvincent]

Added several new pre-commit hooks for improved code quality checks and validation, including TOML, JSON, merge conflict, case conflict, and mixed line ending checks. Also corrected a data value in PISA18sampleScale.csv from -0.907727459 to 0.907727459.

---

📚 Documentation preview 📚: https://causalpy--573.org.readthedocs.build/en/573/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.95%. Comparing base (1fc193b) to head (5bd79dd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #573   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files          33       33           
  Lines        4776     4776           
=======================================
  Hits         4392     4392           
  Misses        384      384           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.