Update module spf13/viper to v1.7.1

[renovate[bot]]

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`](https://togithub.com/spf13/viper/releases/v1.7.1) [Compare Source](https://togithub.com/spf13/viper/compare/v1.7.0...v1.7.1) This release contains a bugfix for environment variable expansion. See [#​495](https://togithub.com/spf13/viper/issues/495) and [#​940](https://togithub.com/spf13/viper/issues/940) for details.

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