chore: remove unused source field from package.json

Author: jarvisjiang

package.json

@@ -5,7 +5,6 @@
   "license": "MIT",
   "version": "1.4.0",
   "type": "module",
-  "source": "src/mod.ts",
   "main": "dist/main.cjs",
   "module": "dist/main.mjs",
   "types": "dist/types.d.ts",