fix(deps): update dependency nconf to ^0.13.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	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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