allow building against vulkan 1.2 headers

e.g. on ubuntu 20.04
diff --git a/include/vk_mem_alloc.h b/include/vk_mem_alloc.h
index ccb8990..c228173 100644
--- a/include/vk_mem_alloc.h
+++ b/include/vk_mem_alloc.h
@@ -16169,11 +16169,11 @@
 
                 json.WriteString("apiVersion");
                 json.BeginString();
-                json.ContinueString(VK_API_VERSION_MAJOR(deviceProperties.apiVersion));
+                json.ContinueString(VK_VERSION_MAJOR(deviceProperties.apiVersion));
                 json.ContinueString(".");
-                json.ContinueString(VK_API_VERSION_MINOR(deviceProperties.apiVersion));
+                json.ContinueString(VK_VERSION_MINOR(deviceProperties.apiVersion));
                 json.ContinueString(".");
-                json.ContinueString(VK_API_VERSION_PATCH(deviceProperties.apiVersion));
+                json.ContinueString(VK_VERSION_PATCH(deviceProperties.apiVersion));
                 json.EndString();
 
                 json.WriteString("GPU");