Should we use RHEL9 as packaging platform from Qt 6.9.0 ->

It seems RHEL8 official support is ending quite a soon and RHEL8 is used as a packaging platform (Qt prebuild binaries is built by using it) in Qt 6.8 & older qt releases. So would it be good timing to move packaging from RHEL8 to RHEL9 starting from Qt 6.9.0?

The change self is pretty straightforward, we already have RHEL9 in ci so work amount would be quite a small. But there is some known limitations etc. to be considered before making the decision:

• RHEL9 has glibc version 2.34 (RHEL 8 uses 2.28) and so on using RHEL9 as a packaging platform would make our prebuilt binaries unusable all linux distros having older glibc version (e.g. Ubuntu 20.04, Rhel8, Debian 11 etc)
  • Note that this doesn't mean Qt can't support these older distros, it just mean our prebuilt binaries won't work there.
• Qt Creator, Qt Installer etc. will have the same limitation when it starts use Qt 6.9 in its builds
  • Do those need to be built to the top of Qt 6.9 or could those use Qt 6.8 instead to keep the compatibility?