Change type of Any when synthesizing BaseSettings.__init__ signature in the mypy plugin

[Viicos]

Fixes #11313 (a previous fix was issued in pydantic-settings, but caused a regression. Here is a more robust fix).

Change Summary

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

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[Viicos]

@dmontagu, I'm wondering if this could be used also more broadly, to solve this issue, where we only documented a workaround.

[codspeed-hq]

CodSpeed Performance Report

Merging #11497 will not alter performance

_{Comparing mypy-explicit-any-settings (4cafa69) with main (acb0f10)}

Summary

✅ 46 untouched benchmarks

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
pydantic
mypy.py					1166
Project Total

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