fix(deps): update module github.com/spf13/viper to v1.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/spf13/viper	require	minor	v1.8.1 -> v1.9.0

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Release Notes

spf13/viper

### [`v1.9.0`](https://togithub.com/spf13/viper/releases/v1.9.0) [Compare Source](https://togithub.com/spf13/viper/compare/v1.8.1...v1.9.0) This is a maintenance release primarily containing minor fixes and improvements. #### Changes ##### Added - Experimental new encoding layer - Add support for `tfvars` files ##### Fixed - Writing hidden files with no extension - `InConfig` processing paths *** In addition to the above changes, this release comes with tons of minor improvements, documentation changes an dependency updates. **Many thanks to everyone who contributed to this release!**

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[elliotcourant]

bors r+

[bors[bot]]

Build succeeded:

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