Update innovation release to MySQL 8.3.0.

[desrosj]

Happy to make adjustments. I couldn't find good docs on the right steps to take when updating versions, but wanted to make a first pass.

[jnoordsij]

Hey there! Thanks for your effort, I also noticed the new image has not appeared yet. These updates should be added automatically, but I noticed the automatic job triggering this is failing due to the new GPG key being used:

Packaging Notes
Important Change: The GnuPG build key (A8D3785C) used to sign MySQL downloadable packages has been updated. The previous GnuPG build key (3A79BD29) expired on 2023-12-14. For information about verifying the integrity and authenticity of MySQL downloadable packages using GnuPG signature checking, or to obtain a copy of our public GnuPG build key, see Signature Checking Using GnuPG.

Extracted from https://dev.mysql.com/doc/relnotes/mysql/8.3/en/news-8-3-0.html; similarly present on https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-36.html.

To ensure the image builds properly, an update of the Dockerfile templates containing updates to the GPG keys is needed. You should be able to add the new key and then run update.sh to ensure all templates and versions are properly updated.

If unsure how to proceed let me know, I'd be willing to follow-up with a new MR (or maybe a maintainer is ready to jump in? @tianon 😇).

[tianon]

Ouch, yep, thanks @jnoordsij! Looks like #1016 is back and now hitting the RPM repos (as noted by #1018 😂)