Fix deprecated Google API and Echo middleware usage

[adityathebe]

Fix SA1019 deprecations: option.WithCredentialsJSON and middleware.LoggerWithConfig

Address 2 staticcheck deprecation warnings:

1. option.WithCredentialsJSON in checks/database_backup_gcp.go:145 - use google.CredentialsFromJSON() instead
2. middleware.LoggerWithConfig in pkg/echo/server.go:48 - use middleware.RequestLoggerWithConfig instead