Release Qubes 4.2.3

[marmarek]

Recent kernel fixes needs to be included in the installation image to allow certification of Novacustom V560TU laptop. There are no major changes since 4.2.2, especially templates are the same.

• [x] Update version in qubes-release
• [x] Build new ISO
• [x] Test new ISO
• [x] Upload ISO to mirrors
• [x] Announce

[marmarek]

rc1 ready for announcing for testing

[andrewdavidwong]

Announced:

• https://github.com/QubesOS/qubes-posts/commit/3b2ff01e47d0a5c223204d49f5a5d75f9d1ff36d
• https://www.qubes-os.org/news/2024/09/10/qubes-os-4-2-3-rc1-available-for-testing/

[marmarek]

It's rather short testing period for rc1, but also changes are rather small compared to 4.2.2. Lets try to publish R4.2.3 on this Tuesday (27th), together with the Novacustom certification announcement. @andrewdavidwong can you prepare the announcement?

cc @wessel-novacustom