Fix Lint Errors

[dchukhin]

This pull request fixes the lint errors that occurred in https://github.com/lincolnloop/django-layout/actions/runs/9824778715/job/27124154433.
Note: it looks like the CI lint check fails, because it builds a project based on the code in the main branch (maybe that workflow should create the project based on the code in the pull request branch?). Locally, doing git checkout fix-lint-errors and ruff check . shows no errors. Or:

django-admin startproject \
           --template=https://github.com/lincolnloop/django-layout/zipball/fix-lint-errors \
           --extension=py,md,gitignore,yml,json \
           --name=Makefile,Dockerfile \
           --exclude=.github \
           testproj2

ruff check ./testproj2