Update mypy requirement from ^0.950 to ^0.961

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.950...v0.961)

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

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

pyproject.toml

@@ -36,7 +36,7 @@ marisa-trie = "^0.7.7"
 
 [tool.poetry.dev-dependencies]
 pytest = "^7.0.0"
-mypy = "^0.950"
+mypy = "^0.961"
 flake8 = ">=3.8"
 black = "^22.1"
 flake8-annotations-complexity = "^0.0.6"