need a .cjs extension for your cjs files

Without a .cjs extension `require`ing the package yields:

```
Error [ERR_REQUIRE_ESM]: require() of ES Module /home/zacknewsham/Sites/albius/services/accountant/app/node_modules/@inway/meteor-random/cjs/index.js not supported.
```

making your cjs folder useless I believe - same error on multiple node versions 14-22.