Update dependency nconf to ^0.13.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
nconf	^0.12.0 -> ^0.13.0

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Release Notes

flatiron/nconf (nconf)

v0.13.0

Compare Source

Features

• add env prefix option (#​428) (c0c8787)

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Configuration

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (4a29703) to head (e9bf440).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   89.74%   89.74%           
=======================================
  Files         112      112           
  Lines        7595     7595           
  Branches     1082     1081    -1     
=======================================
  Hits         6816     6816           
  Misses        771      771           
  Partials        8        8           

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