Update module spf13/viper to v1.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/spf13/viper	require	patch	v1.7.0 -> v1.7.1

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Release Notes

spf13/viper

v1.7.1

Compare Source

This release contains a bugfix for environment variable expansion. See #​495 and #​940 for details.

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[codecov]

Codecov Report

Merging #73 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   86.66%   86.66%           
=======================================
  Files           1        1           
  Lines         195      195           
=======================================
  Hits          169      169           
  Misses         24       24           
  Partials        2        2           

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