Vulkan: update shaderc v2026.2 -> v2026.3

GitOrigin-RevId: 2117a2d4f024795e5023bba95b106c122c7eb6de

Author: alexey-romanov

LICENSE.md

@@ -1809,7 +1809,7 @@ freely, subject to the following restrictions:
 
 ---
 
-### shaderc,v2026.2,Apache-2.0,google,https://github.com/google/shaderc
+### shaderc,v2026.3,Apache-2.0,google,https://github.com/google/shaderc
 
 ```
                                  Apache License