ci: Bump PySide6 version in Fedora end-user envs #2875

Job	Run time
windows	4m 58s
build-deb	18m 32s
Build and install a Dangerzone RPM on Fedora 38	23m 2s
macOS	3m 4s
Build and install a Dangerzone RPM on Fedora 39	23m 6s
install-deb (ubuntu-20.04, ubuntu, 20.04)	3m 5s
install-deb (ubuntu-22.04, ubuntu, 22.04)	2m 22s
install-deb (ubuntu-23.10, ubuntu, 23.10)	1m 56s
install-deb (debian-bullseye, debian, bullseye)	2m 59s
install-deb (debian-bookworm, debian, bookworm)	2m 5s
install-deb (debian-trixie, debian, trixie)	2m 22s
	1h 27m 31s

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