build(deps): bump github.com/spf13/viper from 1.16.0 to 1.18.1

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.16.0 to 1.18.1.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.16.0...v1.18.1)

---
updated-dependencies:
- dependency-name: github.com/spf13/viper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.17.0
 	github.com/rs/zerolog v1.31.0
-	github.com/spf13/viper v1.16.0
+	github.com/spf13/viper v1.18.1
 	github.com/stretchr/testify v1.8.4
 )