apply black linting to whole project.

.gitattributes

.github/dependabot.yml

.pre-commit-config.yaml

MANIFEST.in

ci/build-wheels.sh

ci/download_release_files.py

docs/api/index.rst

docs/cli.rst

docs/doc8.ini

docs/requirements.txt

mypy.ini

requirements.txt

src/littlefs/__init__.py

src/littlefs/__main__.py

src/littlefs/context.py

src/littlefs/errors.py

src/littlefs/lfs.pyi

src/littlefs/lfs.pyx

test/lfs/conftest.py

test/lfs/test_dir_functions.py