chore(deps-dev): update mypy requirement from >=1.8 to >=1.20.2

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...v1.20.2)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -52,7 +52,7 @@ dev = [
     "pytest-benchmark>=4.0",
     "pypdf>=4.0",
     "pdfplumber>=0.10",
-    "mypy>=1.8",
+    "mypy>=1.20.2",
     "ruff>=0.3",
     "reportlab>=4.0,<4.2",
     "pandas>=2.0",