Update to monty 0.0.18

[ggozad]

Monty 0.0.18 introduces support for with open() syntax which was unsupported previously.
Since this is a common error we get in evaluations, we would like to eventually update the analysis SKILL.md to remove the complex rules around it.

[ggozad]

While with open() is indeed fixed, there is no support for iterable file objects, so we still need to introduce a rule disallowing the idiomatic for line in open(): …
See pydantic/monty#490
Till that is fixed we stick with the current rules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.54%. Comparing base (e70f271) to head (ec91b64).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #419   +/-   ##
=======================================
  Coverage   95.54%   95.54%           
=======================================
  Files         119      119           
  Lines        6602     6602           
=======================================
  Hits         6308     6308           
  Misses        294      294           

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