Update vulkanmemoryallocator to 3.2.1 (#152)

Author: kasperk81

DEPS

@@ -56,7 +56,7 @@ deps = {
   "third_party/externals/piex"                   : "https://android.googlesource.com/platform/external/piex.git@bb217acdca1cc0c16b704669dd6f91a1b509c406",
   # "third_party/externals/sfntly"                 : "https://chromium.googlesource.com/external/github.com/googlei18n/sfntly.git@b55ff303ea2f9e26702b514cf6a3196a2e3e2974",
   # "third_party/externals/swiftshader"            : "https://swiftshader.googlesource.com/SwiftShader@7f4d495c89c200c1945cce5995d348dd41dadb5a",
-  "third_party/externals/vulkanmemoryallocator"  : "https://chromium.googlesource.com/external/github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator@a6bfc237255a6bac1513f7c1ebde6d8aed6b5191",
+  "third_party/externals/vulkanmemoryallocator"  : "https://chromium.googlesource.com/external/github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator@c788c52156f3ef7bc7ab769cb03c110a53ac8fcb",
   # vulkan-deps is a meta-repo containing several interdependent Khronos Vulkan repositories.
   # When the vulkan-deps revision is updated, those repos (spirv-*, vulkan-*) should be updated as well.
   "third_party/externals/vulkan-deps"            : "https://chromium.googlesource.com/vulkan-deps@1e40b8e966f5dbac2e886e5ba1eb30f660cd5cf9",