ci: Provide starters/templates/examples/docs for automatically bumping dependency versions

[ethanjli]

Currently, bumping the version of a required package repository requires manually running the [dev] plt add-repo subcommand; and bumping the version of a container image requires manually editing compose.yml files. We could reduce toil if version numbers could be bumped automatically on GitHub, e.g. using Renovate or updatecli.

This would reduce the number of manual steps which need to be done in the PlanktoScope OS release checklists.