build(deps-dev): bump mypy from 1.3.0 to 1.4.0

Bumps [mypy](https://github.com/python/mypy) from 1.3.0 to 1.4.0.
- [Commits](python/mypy@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -55,7 +55,7 @@ trio = "^0.22"
 attrs = "^23.1"
 httpx = "^0.24"
 
-mypy = "^1.3.0"
+mypy = "^1.4.0"
 wemake-python-styleguide = "^0.17"
 flake8-pytest-style = "^1.6"
 flake8-pyi = "^23.4"