Bump github.com/spf13/viper from 1.8.1 to 1.9.0

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.8.1...v1.9.0)

---
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

@@ -18,7 +18,7 @@ require (
 	github.com/magiconair/properties v1.8.5
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.8.1
+	github.com/spf13/viper v1.9.0
 	github.com/stretchr/testify v1.7.0
 	github.com/tilinna/clock v1.1.0
 	golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d
@@ -55,7 +55,7 @@ require (
 	github.com/evanphx/json-patch v4.2.0+incompatible // indirect
 	github.com/fatih/color v1.12.0 // indirect
 	github.com/fatih/structtag v1.2.0 // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/fzipp/gocyclo v0.3.1 // indirect
 	github.com/go-critic/go-critic v0.5.6 // indirect
 	github.com/go-toolsmith/astcast v1.0.0 // indirect
@@ -79,7 +79,7 @@ require (
 	github.com/golangci/misspell v0.3.5 // indirect
 	github.com/golangci/revgrep v0.0.0-20210208091834-cd28932614b5 // indirect
 	github.com/golangci/unconvert v0.0.0-20180507085042-28b1c447d1f4 // indirect
-	github.com/google/go-cmp v0.5.5 // indirect
+	github.com/google/go-cmp v0.5.6 // indirect
 	github.com/google/gofuzz v1.0.0 // indirect
 	github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d // indirect
 	github.com/gordonklaus/ineffassign v0.0.0-20210225214923-2e10b2664254 // indirect
@@ -116,7 +116,7 @@ require (
 	github.com/mgechev/dots v0.0.0-20190921121421-c36f7dcfbb81 // indirect
 	github.com/mgechev/revive v1.1.1 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
+	github.com/mitchellh/mapstructure v1.4.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/moricho/tparallel v0.2.1 // indirect
@@ -125,7 +125,7 @@ require (
 	github.com/nishanths/exhaustive v0.2.3 // indirect
 	github.com/nishanths/predeclared v0.2.1 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
-	github.com/pelletier/go-toml v1.9.3 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
 	github.com/phayes/checkstyle v0.0.0-20170904204023-bfd46e6a821d // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
@@ -144,7 +144,7 @@ require (
 	github.com/sonatard/noctx v0.0.1 // indirect
 	github.com/sourcegraph/go-diff v0.6.1 // indirect
 	github.com/spf13/afero v1.6.0 // indirect
-	github.com/spf13/cast v1.3.1 // indirect
+	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/cobra v1.2.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/ssgreg/nlreturn/v2 v2.1.0 // indirect
@@ -162,14 +162,14 @@ require (
 	github.com/yeya24/promlinter v0.1.0 // indirect
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
 	golang.org/x/mod v0.4.2 // indirect
-	golang.org/x/oauth2 v0.0.0-20210402161424-2e8d93401602 // indirect
-	golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e // indirect
+	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f // indirect
+	golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf // indirect
 	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 // indirect
 	golang.org/x/text v0.3.6 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/ini.v1 v1.62.0 // indirect
+	gopkg.in/ini.v1 v1.63.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 	honnef.co/go/tools v0.2.1 // indirect