GHA: Fix Vulkan SDK installation step #697

Job	Run time
🧪 Unit tests	3m 5s
cache-env	1s
🔌 GDExtension / 🐧 Linux (x86_64, release)	34s
🔌 GDExtension / 🐧 Linux (x86_64, debug)	30s
🍎 macOS / Editor (x86_64, release)	19m 6s
🐧 Linux / Editor (x86_64, release)	14m 50s
🪟 Windows / Editor (x86_64, release)	7m 52s
🍎 macOS / Editor (arm64, release)	20m 47s
🔌 GDExtension / 🪟 Windows (x86_64, release)	2m 54s
🐧 Linux / Template (x86_64, release)	9m 30s
🔌 GDExtension / 🪟 Windows (x86_64, debug)	3m 6s
🐧 Linux / Editor .NET (x86_64, release)	15m 59s
🔌 GDExtension / 🍎 macOS (universal, release)	53s
🔌 GDExtension / 🍎 macOS (universal, debug)	54s
🔌 GDExtension / 📦 Package extension	29s
🍎 macOS / Make macOS Bundles (tmp-macos, false, true)	43s
	1h 41m 13s

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