Add Dependabot config and switch Release Drafter to Changelog config

[tsalo]

Closes none.

Changes proposed in this pull request:

• Add a dependabot config to automatically open PRs updating to new versions of dependencies. This will help us keep up to date and flag any incompatible versions.
• Switch from release drafter to a changelog config. We can use PR labels to organize our release notes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.51%. Comparing base (f9551a9) to head (d8897ef).
Report is 54 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1024   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files          26       26           
  Lines        3453     3453           
  Branches      630      630           
=======================================
  Hits         3091     3091           
  Misses        210      210           
  Partials      152      152           

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[eurunuela]

This is great @tsalo, thank you!

[handwerkerd]

I agree with this plan so I'll approve, but I have no clue how to evaluate/test if you set this up correctly. My assumption is, if there are issues, we'll find out if we merge this first and then see what happens when the mapca version is updated.

[tsalo]

Thanks @eurunuela and @handwerkerd!

@handwerkerd yeah, unfortunately it's one of those things where we'll find any problems after merging, but I did copy over these files from a repo I maintain that is working well, so I think it'll be okay.