Bug#1081707: pulseaudio v16 request bugfix backport

[Tim Blechmann]

Package: pulseaudio
Version: 16.1+dfsg1-5.1

pulseaudio v16 has bugs that cause gstreamer pipelines to hang, leading 
to bugs in qt's multimedia backend (and potentially other applications 
based on gstreamer).

these two patches are in v17, but not in v16.1 are required to fix the bug:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/745
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/764

it would be great if they could be backported to the debian packages of 
pulseaudio 16.1 (afaict this issue affects debian 11 and 12)

many thanks,
tim