update vkquake submodule #668

Job	Run time
quakespasm - Linux Clang	59s
quakespasm - Linux GCC	1m 51s
quakespasm - macOS Intel	1m 12s
quakespasm - macOS ARM	40s
quakespasm - MSVC 32-bit	1m 20s
quakespasm - MSVC 64-bit	51s
quakespasm-spiked - Linux Clang	1m 14s
quakespasm-spiked - Linux GCC	1m 2s
quakespasm-spiked - macOS Intel	1m 4s
quakespasm-spiked - macOS ARM	37s
quakespasm-spiked - MSVC 32-bit	1m 34s
quakespasm-spiked - MSVC 64-bit	1m 8s
vkquake - Linux Clang	2m 25s
vkquake - Linux GCC	2m 37s
vkquake - macOS Intel	1m 18s
vkquake - macOS ARM	43s
vkquake - MSVC 32-bit	1m 2s
vkquake - MSVC 64-bit	1m 2s
ironwail - Linux Clang	1m 10s
ironwail - Linux GCC	1m 2s
ironwail - macOS Intel	1m 8s
ironwail - macOS ARM	52s
ironwail - MSVC 32-bit	1m 34s
ironwail - MSVC 64-bit	1m 23s
	29m 48s

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