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Description of problem:
RHEL9 is currently including version 1.2.0 and upstream has recently made a 1.3.0 release of gtk-vnc:

Nov 16, 2021: Release 1.3.0
===========================

 o Add API to request screen rotation
 o Automatically pick gthread coroutine if ucontext is not available
 o Fix meson logic bug when disabling vala
 o Honour choice of python when generating keymaps
 o Fix error reporting and memory leaks encrypting auth data
 o Fix missing includes for GDK quartz and broadway backends
 o Switch to GNUTLS for VNC auth challenge to fix empty password handling
 o Fix handling of auth subtypes in gvnccapture program

As per the above notes, the only new feature is screen rotation support. Aside from that it is primarily a bug fix release and includes a fix for a regression we introduced in 8.4 tracked in bug 2024233. A rebase is considered to be not significantly higher risk than backporting the various bug fixes.

gtk-vnc-1.3.0-1.el9.src.rpm, I did some sanity checks + checked the rotation feature

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: gtk-vnc), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2512