The `file-contents-sorter` pre-commit hook doesn't handle comments well

[bmispelon]

I wanted to add a comment for one of the dependencies in requirements/common.txt and noticed that the file-contents-sorter pre-commit hook complained because it tries to sort all lines alphabetically.

I tried ignoring the hook by committing with --no-verify but the change was made automatically in the PR anyway via the pre-commit bot.

It's nice having dependencies sorted alphabetically, but comments should also be supported. Not sure if that's something that can be configured, or if we can switch to a different hook that would support that usecase.