chore(deps): bump github.com/spf13/viper from 1.8.1 to 1.9.0 (#3382)

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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -42,7 +42,7 @@ require (
 	github.com/soheilhy/cmux v0.1.5
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.8.1
+	github.com/spf13/viper v1.9.0
 	github.com/spiffe/go-spiffe v0.0.0-20190820222348-6adcf1eecbcc
 	github.com/spiffe/spire v0.12.3
 	github.com/spiffe/spire/proto/spire v0.12.0 // indirect
@@ -70,7 +70,7 @@ require (
 )
 
 require (
-	cloud.google.com/go v0.88.0 // indirect
+	cloud.google.com/go v0.93.3 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Azure/go-autorest v14.2.0+incompatible // indirect
 	github.com/Azure/go-autorest/autorest v0.11.20 // indirect
@@ -107,7 +107,7 @@ require (
 	github.com/evanphx/json-patch v4.11.0+incompatible // indirect
 	github.com/fatih/color v1.12.0 // indirect
 	github.com/form3tech-oss/jwt-go v3.2.5+incompatible // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/go-errors/errors v1.0.2-0.20180813162953-d98b870cc4e0 // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect
@@ -146,7 +146,7 @@ require (
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-testing-interface v1.0.0 // indirect
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
+	github.com/mitchellh/mapstructure v1.4.2 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/moby/spdystream v0.2.0 // indirect
 	github.com/moby/sys/mount v0.2.0 // indirect
@@ -162,7 +162,7 @@ require (
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/opencontainers/image-spec v1.0.1 // indirect
 	github.com/opencontainers/runc v1.0.2 // indirect
-	github.com/pelletier/go-toml v1.9.3 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/pquerna/otp v1.2.0 // indirect
 	github.com/prometheus/procfs v0.6.0 // indirect
@@ -171,7 +171,7 @@ require (
 	github.com/shopspring/decimal v1.2.0 // indirect
 	github.com/sirupsen/logrus v1.8.1 // 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/jwalterweatherman v1.1.0 // indirect
 	github.com/spiffe/go-spiffe/v2 v2.0.0-beta.4 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
@@ -187,15 +187,15 @@ require (
 	go.uber.org/atomic v1.7.0 // indirect
 	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
 	golang.org/x/mod v0.5.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20210628180205-a41e5a781914 // indirect
+	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f // indirect
 	golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d // indirect
 	golang.org/x/text v0.3.7 // indirect
 	golang.org/x/tools v0.1.5 // indirect
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // 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/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect