build(deps): bump github.com/spf13/viper from 1.15.0 to 1.18.2

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.15.0 to 1.18.2.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.15.0...v1.18.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -9,8 +9,8 @@ require (
 	github.com/sirupsen/logrus v1.9.0
 	github.com/spf13/cobra v1.7.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.15.0
-	github.com/stretchr/testify v1.8.2
+	github.com/spf13/viper v1.18.2
+	github.com/stretchr/testify v1.8.4
 	gopkg.in/square/go-jose.v2 v2.6.0
 )
 
@@ -19,10 +19,10 @@ require (
 	github.com/ProtonMail/go-crypto v0.0.0-20230217124315-7d5c6f04bbb8 // indirect
 	github.com/acomagu/bufpipe v1.0.4 // indirect
 	github.com/cloudflare/circl v1.3.3 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/fatih/color v1.14.1 // indirect
-	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.4.1 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
@@ -34,26 +34,30 @@ require (
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.17 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.0.6 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
 	github.com/pjbgf/sha1cd v0.3.0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rogpeppe/go-internal v1.8.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/secure-systems-lab/go-securesystemslib v0.5.0 // indirect
 	github.com/sergi/go-diff v1.3.1 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
 	github.com/skeema/knownhosts v1.1.0 // indirect
-	github.com/spf13/afero v1.9.3 // indirect
-	github.com/spf13/cast v1.5.0 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/subosito/gotenv v1.4.2 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
 	golang.org/x/crypto v0.17.0 // indirect
-	golang.org/x/mod v0.8.0 // indirect
-	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/mod v0.12.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
 	golang.org/x/sys v0.15.0 // indirect
 	golang.org/x/term v0.15.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/tools v0.6.0 // indirect
+	golang.org/x/tools v0.13.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect