chore: fix black caused mypy errors #1337

Job	Run time
linting-and-style-checks (3.9, black)	16s
unit-tests (ubuntu-20.04, 3.9, clean,py39-pytest-cov,report)	2m 16s
linting-and-style-checks (3.9, flake8)	17s
unit-tests (ubuntu-20.04, 3.9, py39-cookiecutter)	22s
linting-and-style-checks (3.9, gitlint)	20s
unit-tests (ubuntu-20.04, 3.10, clean,py310-pytest-cov,report)	2m 42s
linting-and-style-checks (3.9, isort)	13s
linting-and-style-checks (3.9, mypy)	53s
unit-tests (ubuntu-20.04, 3.10, py310-cookiecutter)	28s
unit-tests (windows-latest, 3.9, clean,py39-pytest-cov,report)	2m 49s
unit-tests (windows-latest, 3.9, py39-cookiecutter)	54s
unit-tests (windows-latest, 3.10, clean,py310-pytest-cov,report)	3m 10s
unit-tests (windows-latest, 3.10, py310-cookiecutter)	50s
	15m 30s

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