🤖 build: Fix main output file extension.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/make-github-pseudonymous-again/rejuvenate/blob/042c55f2254a9efdce5074d537141d6f85a98927/src/transforms/build:microbundle-fix-cjs.js
Please contact the author of the transform if you believe there was an error.

package.json

@@ -21,7 +21,7 @@
   ],
   "sideEffects": false,
   "source": "src/index.js",
-  "main": "dist/index.js",
+  "main": "dist/index.cjs",
   "module": "dist/index.module.js",
   "esmodule": "dist/index.modern.js",
   "umd:main": "dist/index.umd.js",
@@ -30,7 +30,7 @@
     ".": {
       "browser": "./dist/index.module.js",
       "umd": "./dist/index.umd.js",
-      "require": "./dist/index.js",
+      "require": "./dist/index.cjs",
       "default": "./dist/index.modern.js"
     }
   },