This file contains a list of other files where versions of packages are specified so that they can easily be found when upgrading a dependency version, keeping them all in sync.
In the future it would be advantageous to implement an automated way of keep versions synchronised across files e.g. pre-commit/pre-commit#945 (comment) or preferably parsing .pre-commit-config.yaml and using it to pip install requirements (see discussion here: #1449 (comment)). Until then, the files are listed below for manual checking and updating.