chore: create dependabot.yml

[MichaelDeBoey]

Re-submission of mysticatea#35

This will create automatic PRs to update both dependencies + actions used in workflows, so we won't need manual PRs like mysticatea#34 anymore

[codecov-commenter]

Codecov Report

Base: 97.16% // Head: 97.16% // No change to project coverage 👍

Coverage data is based on head (df3d31c) compared to base (1cc30ef).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #3   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files          37       37           
  Lines         388      388           
=======================================
  Hits          377      377           
  Misses         11       11           

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[github-actions]

🎉 This PR is included in version 13.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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