build: Update to header 1.2.174

- Update known-good
- Generate source (no changes)

Change-Id: Ia2099a0d63692c19ce8444721d5eb25f94c809d9
diff --git a/scripts/known_good.json b/scripts/known_good.json
index c3b4483..536832d 100644
--- a/scripts/known_good.json
+++ b/scripts/known_good.json
@@ -6,7 +6,7 @@
       "sub_dir" : "Vulkan-Headers",
       "build_dir" : "Vulkan-Headers/build",
       "install_dir" : "Vulkan-Headers/build/install",
-      "commit" : "v1.2.173"
+      "commit" : "v1.2.174"
     }
   ],
   "install_names" : {