Outdated Go GORM example

Hi! Any plans to update the Go GORM example to use the latest CockroachDB and latest GORM?

Locate the Go GORM example and inspect its dependency declarations and setup. Compare the referenced CockroachDB and GORM versions with their current releases, then run the example to verify it still works with the updated versions. Done means the example uses the latest requested dependencies and remains runnable.

索引モデルが issue の本文から書いたものです。