Bumped VulkanSDK version number to fix automated build

Author: robertosfield

.github/workflows/ci.yml

@@ -10,12 +10,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        vulkan-version: [1.3.250.1]
+        vulkan-version: [1.3.268.0]
         build-shared: [OFF]
         include:
           - build-shared: ON
             os: windows-latest
-            vulkan-version: 1.3.250.1
+            vulkan-version: 1.3.268.0
     continue-on-error: ${{ matrix.vulkan-version == 'latest' }}
 
     steps: