[release/6.0] Add win-arm64 entry for browser-wasm cross pack (#78535)

Co-authored-by: Steve Pfister <[email protected]>

Author: steveisok

src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.Manifest/WorkloadManifest.json.in

@@ -413,6 +413,7 @@
       "version": "${PackageVersion}",
       "alias-to": {
         "win-x64": "Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.browser-wasm",
+        "win-arm64": "Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.browser-wasm",
         "linux-x64": "Microsoft.NETCore.App.Runtime.AOT.linux-x64.Cross.browser-wasm",
         "osx-x64": "Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.browser-wasm",
         "osx-arm64": "Microsoft.NETCore.App.Runtime.AOT.osx-x64.Cross.browser-wasm"