Update mypy from 1.5.1 to 1.6.0

{{cookiecutter.project_slug}}/requirements/local.txt

@@ -13,7 +13,7 @@ watchfiles==0.20.0  # https://github.com/samuelcolvin/watchfiles
 
 # Testing
 # ------------------------------------------------------------------------------
-mypy==1.5.1  # https://github.com/python/mypy
+mypy==1.6.0  # https://github.com/python/mypy
 django-stubs[compatible-mypy]==4.2.4  # https://github.com/typeddjango/django-stubs
 pytest==7.4.2  # https://github.com/pytest-dev/pytest
 pytest-sugar==0.9.7  # https://github.com/Frozenball/pytest-sugar