pkg/cmd/generate-spatial-ref-sys EPSG.io API endpoints will be deprecated after the 1st of February 2025

**Describe the problem**
https://github.com/cockroachdb/cockroach/blob/453c827b212c9a77a19dba87eb81d194261c94d0/pkg/cmd/generate-spatial-ref-sys/main.go#L139

Hi, EPSG.io API endpoints will be deprecated after the 1st of February 2025: https://epsg.io/docs#migration
The mentioned code will not work anymore, but I am not sure to what extent this will affect your application.

You can easily replace them with a new endpoint from MapTiler. However, the new endpoint requires an API key, so you'd probably need to make it possible for your users to add it using an env variable or something similar.

More extensive documentation: https://documentation.maptiler.com/hc/en-us/articles/360020950098-How-to-migrate-from-EPSG-io-to-MapTiler-Coordinates-API

Jira issue: CRDB-45265