chore: update version to 0.2.0-beta.9 in deno.json

Author: yaonyan

packages/core/deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@mcpc/core",
-  "version": "0.2.0-beta.8",
+  "version": "0.2.0-beta.9",
   "exports": {
     ".": "./mod.ts",
     "./plugins": "./plugins.ts",