Run pre-commit run --all to unify code formatting

[shoeffner]

While preparing the PR for #192, I ran pre-commit run --all and then decided to revert those changes and instead run it before I'd make my changes, i.e., on the main branch directly. The result will be in the PR for this issue.

Note that I ran the tests locally after running pre-commit run --all, so I guess even though it changed lots of data files and even some docs, this should still be fine. (Except I had to change the DV_VERSION, but that's on a separate branch. See #195)