proposed schedule for 9.0 release

[Peter Maydell]

Here's my proposal for the freeze dates for 9.0:

2024-03-12 Soft feature freeze (all feature changes must be in
           a pullreq on list by this date)
2024-03-19 Hard feature freeze. Tag rc0
2024-03-26 Tag rc1
2024-04-02 Tag rc2
2024-04-09 Tag rc3
2024-04-16 Release; or tag rc4 if needed
2024-04-23 Release if we needed an rc4

(Easter is 29Mar-1Apr this year, but we can hardly avoid
that entirely.)

Any objections/suggested tweaks?

thanks
-- PMM