CI/macOS: Run `create-dmg` as root #292

Job	Run time
Code Linting / Format / Lint	6s
macOS / Build (debug, homebrew (qt5), macos-13)	2m 6s
macOS / Build (debug, homebrew (qt6), macos-13)	2m 49s
macOS / dmg (release, Qt 5.15.2, macos-13)	3m 16s
macOS / dmg (release, Qt 6.5.2, macos-13)	5m 14s
Linux / rpm (release, Qt 6, fedora-38)	1m 52s
Linux / deb (release, Qt 5, ubuntu-20_04)	1m 23s
Linux / rpm (release, Qt 6, opensuse-15_5)	2m 36s
Linux / deb (release, Qt 6, ubuntu-22_04)	2m 13s
Linux / snap	4m 28s
Linux / deb (release, Qt 6, ubuntu-23_10)	2m 10s
Windows / Build (x64, release, Qt 5.15.2, windows-2019)	2m 9s
Linux / AppImage (release, Qt 5, appimage-qt5)	1m 56s
Windows / Build (x86, release, Qt 5.15.2, windows-2019)	2m 16s
Linux / AppImage (release, Qt 6, appimage-qt6)	2m 8s
Windows / Build (x64, release, Qt 6.4.3, windows-2019)	2m 49s
Windows / Unified x64-x86 Installer	57s
	40m 28s

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