chore(sdk/js): bump to 0.5.8-beta.0 for release workflow testing

Author: Leechael

sdk/js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@phala/dstack-sdk",
-  "version": "0.5.7",
+  "version": "0.5.8-beta.0",
   "description": "dstack SDK",
   "main": "dist/node/index.js",
   "types": "dist/node/index.d.ts",