Create Documentation Outlining Dependency Update Approaches

[SorenSpicknall]

User story / feature request

As a maintainer of one or more tools, images, etc. in this repository, I would like to know how best to detect and resolve out-of-date dependencies. I'd like to see documentation, drawn from past best practices, for how to triage dependabot activity and how to make dependency version updates across different systems (requirements.txt, pyproject.yaml, etc.).

Acceptance Criteria

A set of docs outlining past practice for dependency management, including tips for making upgrades cleanly with limited risk of conflicts or other errors.

Notes

Some general guiding philosophy is outlined briefly here.