Looks like that after Bitnami was aquired by Broadcom, images such as Discourse Bitnami won’t be updated anymore.
See Upcoming changes to the Bitnami catalog (effective August 28th, 2025) · Issue #35164 · bitnami/charts · GitHub for more information.
The image registry for Discourse Bitnami image will be deleted soon
Just for reference purposes, I guess it’s good to note that there may, eventually be an official replacement for this. And I’ll emphasize again that this is not stable nor production ready but is already usable if you know what you’re doing and it fits your use case 
But I think it’s good to be aware of this especially for anyone who was relying on bitnami previously.