Update module github.com/spf13/viper to v1.16.0

.../github.com/pelletier/go-toml/v2/internal/tracker/seen.go

...thub.com/pelletier/go-toml/v2/internal/tracker/tracker.go

vendor/github.com/pelletier/go-toml/v2/localtime.go

vendor/github.com/pelletier/go-toml/v2/marshaler.go

vendor/github.com/pelletier/go-toml/v2/strict.go

vendor/github.com/pelletier/go-toml/v2/toml.abnf

vendor/github.com/pelletier/go-toml/v2/types.go

vendor/github.com/pelletier/go-toml/v2/unmarshaler.go

vendor/github.com/pelletier/go-toml/v2/unstable/ast.go

vendor/github.com/pelletier/go-toml/v2/unstable/builder.go

vendor/github.com/pelletier/go-toml/v2/unstable/doc.go

vendor/github.com/pelletier/go-toml/v2/unstable/kind.go

vendor/github.com/pelletier/go-toml/v2/unstable/parser.go

vendor/github.com/pelletier/go-toml/v2/unstable/scanner.go

vendor/github.com/spf13/afero/.gitignore

vendor/github.com/spf13/afero/.travis.yml

vendor/github.com/spf13/afero/README.md

vendor/github.com/spf13/afero/afero.go

vendor/github.com/spf13/afero/appveyor.yml

vendor/github.com/spf13/afero/basepath.go