Update mypy requirement from ==1.6.1 to ==1.8.0 (#2812)

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@v1.6.1...v1.8.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Taner Topal <[email protected]>
Co-authored-by: Daniel J. Beutel <[email protected]>

pyproject.toml

@@ -87,7 +87,7 @@ clang-format = "==17.0.4"
 isort = "==5.13.2"
 black = { version = "==23.10.1", extras = ["jupyter"] }
 docformatter = "==1.7.5"
-mypy = "==1.6.1"
+mypy = "==1.8.0"
 pylint = "==3.0.3"
 flake8 = "==5.0.4"
 pytest = "==7.4.4"