Roll vulkan-deps from 6b02308bdccf to 956ca5369840 (3 revisions)

https://chromium.googlesource.com/vulkan-deps.git/+log/6b02308bdccf..956ca5369840

Changed dependencies:
* vulkan-loader: 0a7407b151..5e96fd5450
* vulkan-validation-layers: 9a307c998f..ca162081a7

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/vulkan-deps-dawn-autoroll
Please CC kainino@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Dawn: https://bugs.chromium.org/p/dawn/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Bug: None
Tbr: kainino@google.com
Change-Id: Id552d549b9913dde866accaf87e8bb4a7010774b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/80620
Bot-Commit: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Dawn Autoroller <dawn-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -138,7 +138,7 @@ deps = {
   },
 
   'third_party/vulkan-deps': {
-    'url': '{chromium_git}/vulkan-deps@6b02308bdccf4c3099368a6b6d449f016d0fb86d',
+    'url': '{chromium_git}/vulkan-deps@956ca5369840b9883e5146895f242d3e6f668d1d',
     'condition': 'dawn_standalone',
   },