Update dependency mypy to v1.20.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mypy (changelog)	==1.19.1 → ==1.20.1

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Release Notes

python/mypy (mypy)

v1.20.1

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• Always disable sync in SQLite cache (Ivan Levkivskyi, PR 21184)
• Temporarily skip few base64 tests (Ivan Levkivskyi, PR 21193)
• Revert dict.__or__ typeshed change (Ivan Levkivskyi, PR 21186)
• Fix narrowing for match case with variadic tuples (Shantanu, PR 21192)
• Avoid narrowing type[T] in type calls (Shantanu, PR 21174)
• Fix regression for catching empty tuple in except (Shantanu, PR 21153)
• Fix reachability for frozenset and dict view narrowing (Shantanu, PR 21151)
• Fix narrowing with chained comparison (Shantanu, PR 21150)
• Avoid narrowing to unreachable at module level (Shantanu, PR 21144)
• Allow dangerous identity comparisons to Any typed variables (Shantanu, PR 21142)
• --warn-unused-config should not be a strict flag (Ivan Levkivskyi, PR 21139)

v1.20.0

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: uv.lock

Command failed: uv lock --upgrade-package mypy
Using CPython 3.14.4 interpreter at: /opt/containerbase/tools/python/3.14.4/bin/python3
  × No solution found when resolving dependencies for split (markers:
  │ python_full_version == '3.9.*'):
  ╰─▶ Because the requested Python version (>=3.9) does not satisfy
      Python>=3.10 and mypy==1.20.1 depends on Python>=3.10, we can conclude
      that mypy==1.20.1 cannot be used.
      And because my-pkg:dev depends on mypy==1.20.1 and your project requires
      my-pkg:dev, we can conclude that your project's requirements are
      unsatisfiable.

      hint: While the active Python version is 3.14, the resolution failed for
      other Python versions supported by your project. Consider limiting your
      project's supported Python versions using `requires-python`.

      hint: The `requires-python` value (>=3.9) includes Python versions that
      are not supported by your dependencies (e.g., mypy==1.20.1 only supports
      >=3.10). Consider using a more restrictive `requires-python` value (like
      >=3.10).