[chore]: Bump github.com/spf13/viper from 1.14.0 to 1.15.0 (#1375)

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.14.0 to 1.15.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](https://github.com/spf13/viper/compare/v1.14.0...v1.15.0)

---
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>

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

vendor/github.com/spf13/viper/internal/encoding/toml/codec.go

@@ -1,39 +1,16 @@
-//go:build viper_toml1
-// +build viper_toml1
-
 package toml
 
 import (
-	"github.com/pelletier/go-toml"
+	"github.com/pelletier/go-toml/v2"
 )
 
 // Codec implements the encoding.Encoder and encoding.Decoder interfaces for TOML encoding.
 type Codec struct{}
 
 func (Codec) Encode(v map[string]interface{}) ([]byte, error) {
-	t, err := toml.TreeFromMap(v)
-	if err != nil {
-		return nil, err
-	}
-
-	s, err := t.ToTomlString()
-	if err != nil {
-		return nil, err
-	}
-
-	return []byte(s), nil
+	return toml.Marshal(v)
 }
 
 func (Codec) Decode(b []byte, v map[string]interface{}) error {
-	tree, err := toml.LoadBytes(b)
-	if err != nil {
-		return err
-	}
-
-	tmap := tree.ToMap()
-	for key, value := range tmap {
-		v[key] = value
-	}
-
-	return nil
+	return toml.Unmarshal(b, &v)
 }