build: fix typo in exports

resolves #232

Author: pi0

package.json

@@ -10,21 +10,21 @@
     ".": {
       "import": {
         "types": "./dist/index.d.mts",
-        "default:": "./dist/index.mjs"
+        "default": "./dist/index.mjs"
       },
       "require": {
         "types": "./dist/index.d.cts",
-        "default:": "./dist/index.cjs"
+        "default": "./dist/index.cjs"
       }
     },
     "./update": {
       "import": {
         "types": "./dist/update.d.mts",
-        "default:": "./dist/update.mjs"
+        "default": "./dist/update.mjs"
       },
       "require": {
         "types": "./dist/update.d.cts",
-        "default:": "./dist/update.cjs"
+        "default": "./dist/update.cjs"
       }
     }
   },