Stabilise `@publicInBinary` in 3.7.0

## Compiler version

https://github.com/scala/scala3/commit/590691b09bb8554dd312a4e942f91dcd43ba6b44

## Notes

To be able to use `@publicInBinary` in #22480, the SIP must be approved in the second round of votes and the implementation must remove the `@experimental`annotation
