Explicitly specify setup-java architecture in win-cpu-arm64-build.yml. (microsoft#1685)

Fix a CI build issue. For some reason, the Windows ARM64 CI job was
using the x64 Java SDK.

Author: edgchen1

.github/workflows/win-cpu-arm64-build.yml

@@ -40,6 +40,7 @@ jobs:
         with:
           java-version: '21'
           distribution: 'temurin'
+          architecture: 'aarch64'
           cache: 'gradle'
 
       - name: Setup Gradle