chore(deps-dev): Update mypy requirement

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Commits](python/mypy@v0.971...v1.4.1)

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

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

pyproject.toml

@@ -14,7 +14,7 @@ pydantic = ">=1.9.0,<2.0.0"
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.1.2"
 isort = "^5.10.1"
-mypy = ">=0.971,<1.2"
+mypy = ">=0.971,<1.5"
 flake8 = "^5.0.4"
 flake8-builtins = ">=1.5.3,<3.0.0"
 flake8-annotations = "^2.9.1"