Create dependabot.yml

[jGaboardi]

• Create dependabot.yml
• xref update GHA versions #289

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.8%. Comparing base (8d904db) to head (dccdf8c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #290     +/-   ##
=======================================
- Coverage   99.1%   98.8%   -0.2%     
=======================================
  Files          7       7             
  Lines       1282    1282             
=======================================
- Hits        1270    1267      -3     
- Misses        12      15      +3     

see 1 file with indirect coverage changes

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