Revert "build_spec: lock default vulkancts version"
This reverts commit 577d934f.
Vulkan CTS fixed by 52a217bc1e102b09aeec874bc49739c0dfd3820c
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This reverts commit 577d934f.
Vulkan CTS fixed by 52a217bc1e102b09aeec874bc49739c0dfd3820c