chore: setup dependabot

[kelly-sovacool]

Changes

set up dependabot to bump python & gha versions

Issues

see CCBR/actions#194

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• [ ] Write unit tests for any new features, bug fixes, or other code changes.
• [ ] Update docs if there are any API changes.
• [ ] Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.42%. Comparing base (cf8d927) to head (a9a8e61).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #215   +/-   ##
=======================================
  Coverage   73.42%   73.42%           
=======================================
  Files          28       28           
  Lines        1938     1938           
=======================================
  Hits         1423     1423           
  Misses        515      515           

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