graphics: Accept Vulkan layer manifests up to version 1.2.0
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graphics: Accept Vulkan layer manifests up to version 1.2.0
Version 1.2.0 added some new fields, but nothing critical for our purposes.
Resolves: https://github.com/ValveSoftware/steam-runtime/issues/457
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tests: Assert that we can parse version 1.2.0 Vulkan layer manifests