chore(deps): update module spf13/viper to v1.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/spf13/viper	require	minor	v1.4.0 -> v1.7.1

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Release Notes

spf13/viper

v1.7.1

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

v1.7.0

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This release mostly contains bug and security fixes, but there are a few new features as well:

• The unmaintained github.com/xordataexchange/crypt has been replaced with github.com/bketelsen/crypt
• Added firestore support as a remote config source (thanks @​alxmsl)

v1.6.3

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Fixes uninstallable library on clean GOPATH

v1.6.2

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This is a patch release fixing a(n edge case) bug introduced in v1.6.0

See #​818 and #​827 for details

v1.6.1

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This is a patch release fixing a bug introduced in v1.6.0

v1.6.0

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Changes

Added

• Global UnmarshalExact method
• StringReplacer interface for custom environment key replacing logic
• GolangCI Lint
• INI support
• Key delimiter made configurable
• Support for config files without extensions

Changed

• Moved to GitHub actions build from Travis

Fixed

• IsSet no longer returns true when an unset key has a flags bound
• SafeWriteConfigAs works as expected

Happy Holidays!

v1.5.0

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Documentation and other fixes

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