[deps] Update emdawnwebgpu to v20260423.175430 (#26891)

- Update `emdawnwebgpu` to latest `v20260423.175430`
  - https://github.com/google/dawn/releases/tag/v20260423.175430
```
sha256:3ad7ebe95a4a20764df46c5a63b0ad489782aee26804fff8511d9797c10e732f
sha512:42784f70b67197c614322f9fabb0f1dc64228a0de10e88f99941fa9d29bee9ad6683f4651d4eefd5a7a9fbd1f976eb522b190b683219ed1793e9b531c602ffa6
```

Author: garymathews

tools/ports/emdawnwebgpu.py

@@ -151,14 +151,14 @@
     print('Please see documentation inside this file for details on how to use this port.')
     sys.exit(1)
 
-_VERSION = 'v20251002.162335'
+_VERSION = 'v20260423.175430'
 
 # Remote-specific port information
 
 # - Where to download the port
 EXTERNAL_PORT = f'https://github.com/google/dawn/releases/download/{_VERSION}/emdawnwebgpu_pkg-{_VERSION}.zip'
 # - Hash to verify the download integrity
-SHA512 = 'ed15672c2c495a77c764929e6979f4e155bf8b9c46dee5b0f234f3208a708bc2b846d89eef345b725d03454b56d549531f48fc84ff2afe7627d14115893b0fb0'
+SHA512 = '42784f70b67197c614322f9fabb0f1dc64228a0de10e88f99941fa9d29bee9ad6683f4651d4eefd5a7a9fbd1f976eb522b190b683219ed1793e9b531c602ffa6'
 # - Path of the port inside the zip file
 PORT_FILE = 'emdawnwebgpu_pkg/emdawnwebgpu.port.py'