update vkquake submodule #597

Job	Run time
quakespasm - Linux Clang	48s
quakespasm - Linux GCC	46s
quakespasm - macOS Intel	51s
quakespasm - macOS ARM	48s
quakespasm - MSVC 32-bit	1m 19s
quakespasm - MSVC 64-bit	47s
quakespasm-spiked - Linux Clang	50s
quakespasm-spiked - Linux GCC	46s
quakespasm-spiked - macOS Intel	1m 7s
quakespasm-spiked - macOS ARM	37s
quakespasm-spiked - MSVC 32-bit	48s
quakespasm-spiked - MSVC 64-bit	48s
vkquake - Linux Clang	1m 2s
vkquake - Linux GCC	53s
vkquake - macOS Intel	1m 51s
vkquake - macOS ARM	56s
vkquake - MSVC 32-bit	1m 23s
vkquake - MSVC 64-bit	1m 17s
ironwail - Linux Clang	56s
ironwail - Linux GCC	54s
ironwail - macOS Intel	52s
ironwail - macOS ARM	38s
ironwail - MSVC 32-bit	2m 13s
ironwail - MSVC 64-bit	2m 11s
	25m 21s

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