chore: set release-please version

PiperOrigin-RevId: 499605121

Author: asyncliz

.github/workflows/release-please.yml

@@ -13,5 +13,6 @@ jobs:
         with:
           release-type: node
           package-name: '@material/web'
+          release-as: 1.0.0-alpha.3
           prerelease: true
           bootstrap-sha: 41d41cc2788f237f376d32409f51ca59e9b2bf75