[chore]: Bump github.com/spf13/viper from 1.19.0 to 1.20.0

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.19.0 to 1.20.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](https://github.com/spf13/viper/compare/v1.19.0...v1.20.0)

---
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>

vendor/github.com/spf13/viper/logger.go

@@ -2,46 +2,9 @@ package viper
 
 import (
 	"context"
-
-	slog "github.com/sagikazarmark/slog-shim"
+	"log/slog"
 )
 
-// Logger is a unified interface for various logging use cases and practices, including:
-//   - leveled logging
-//   - structured logging
-//
-// Deprecated: use `log/slog` instead.
-type Logger interface {
-	// Trace logs a Trace event.
-	//
-	// Even more fine-grained information than Debug events.
-	// Loggers not supporting this level should fall back to Debug.
-	Trace(msg string, keyvals ...any)
-
-	// Debug logs a Debug event.
-	//
-	// A verbose series of information events.
-	// They are useful when debugging the system.
-	Debug(msg string, keyvals ...any)
-
-	// Info logs an Info event.
-	//
-	// General information about what's happening inside the system.
-	Info(msg string, keyvals ...any)
-
-	// Warn logs a Warn(ing) event.
-	//
-	// Non-critical events that should be looked at.
-	Warn(msg string, keyvals ...any)
-
-	// Error logs an Error event.
-	//
-	// Critical events that require immediate attention.
-	// Loggers commonly provide Fatal and Panic levels above Error level,
-	// but exiting and panicking is out of scope for a logging library.
-	Error(msg string, keyvals ...any)
-}
-
 // WithLogger sets a custom logger.
 func WithLogger(l *slog.Logger) Option {
 	return optionFunc(func(v *Viper) {