chore: fix ssr compiler version

packages/compiler-ssr/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@vue/compiler-ssr",
-  "version": "3.0.0-alpha.2",
+  "version": "3.0.0-alpha.3",
   "description": "@vue/compiler-ssr",
   "main": "dist/compiler-ssr.cjs.js",
   "types": "dist/compiler-ssr.d.ts",
@@ -27,6 +27,6 @@
   },
   "homepage": "https://github.com/vuejs/vue/tree/dev/packages/compiler-ssr#readme",
   "dependencies": {
-    "@vue/compiler-core": "3.0.0-alpha.2"
+    "@vue/compiler-core": "3.0.0-alpha.3"
   }
 }