deps.qt: Add Qt Designer #347

Job	Run time
Run Pre-Checks	7s
Build Qt6 (macOS)	1m 2s
Build FFmpeg for macOS (macos-arm64)	2m 19s
Build macOS Dependencies (macos-arm64)	2m 54s
Build FFmpeg for macOS (macos-x86_64)	2m 19s
Build FFmpeg for Windows (x64)	3m 32s
Build Windows Dependencies (x64)	3m 12s
Build macOS Dependencies (macos-x86_64)	2m 51s
Build FFmpeg for Windows (x86)	2m 46s
Build Windows Dependencies (x86)	2m 46s
Build Qt6 (Windows) (x64, RelWithDebInfo)	1m 29s
Build Qt6 (Windows) (x64, Debug)	1m 31s
Build Qt6 (Windows) (x86, RelWithDebInfo)	1m 35s
Build Qt6 (Windows) (x86, Debug)	1m 22s
Create macOS Qt6 (${{ matrix.target }})	0s
Package Windows Qt6	0s
Build FFmpeg (Universal)	1m 56s
Build macOS Dependencies (Universal)	1m 11s
Create and upload release	0s
	32m 52s

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