Bump github.com/spf13/viper from 1.4.0 to 1.6.1

[dependabot-preview[bot]]

Bumps github.com/spf13/viper from 1.4.0 to 1.6.1.

Release notes

*Sourced from [github.com/spf13/viper's releases](https://github.com/spf13/viper/releases).* > ## Fix config path lookup > This is a patch release fixing a bug introduced in v1.6.0 > > ## v1.6.0 > ## 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 > Documentation and other fixes

Commits

- [`eabbc68`](https://github.com/spf13/viper/commit/eabbc68a3ecd5cf8c11a2f84dbda5e7a38493b2f) Fix file path lookup - [`5ad4bc0`](https://github.com/spf13/viper/commit/5ad4bc05cf581ee54efd78c7fd58202609d10857) Add decoder opts to unmarshal exact - [`bcb420b`](https://github.com/spf13/viper/commit/bcb420b705de7762472dda0861823d053d7f4cbd) Add global UnmarshalExact method - [`4ad4c8d`](https://github.com/spf13/viper/commit/4ad4c8df70ec1bed8329e5d986f09d34f66200b4) Add string replacer interface and env key replacer option - [`6fcf985`](https://github.com/spf13/viper/commit/6fcf985c5ab78a80370c86454e9556b277c0212c) Fix readme - [`bdf2db0`](https://github.com/spf13/viper/commit/bdf2db0ff8cf8f8fdc1148cb3d8ef40f05209714) Fix goimports - [`a842b8f`](https://github.com/spf13/viper/commit/a842b8f61840c754255435f3c7b131ca89080c78) Replace SetKeyDelimiter with functional options - [`9a405be`](https://github.com/spf13/viper/commit/9a405be5c05f793c04480d3137cf4880d147ccbe) Add SetKeyDelimiter to the README - [`a73303e`](https://github.com/spf13/viper/commit/a73303ee8947b4498218d22e361db6f448ce6654) Add key delimiter setter - [`b6ced70`](https://github.com/spf13/viper/commit/b6ced70067882412976750d782a0df83d6b59eea) Generic improvements - Additional commits viewable in [compare view](https://github.com/spf13/viper/compare/v1.4.0...v1.6.1)

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[dependabot-preview[bot]]

Superseded by #190.