Remove dependabot config

[blakeembrey]

Reducing PR noise. Switching to configuration in GitHub settings for security updates using Dependabot instead of a config file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c4f5b3f) to head (7facf5d).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #404   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          369       369           
  Branches       132       132           
=========================================
  Hits           369       369           

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