🔧 Change .nvmrc format

[patrick91]

I've noticed that 18.x.x is not supported by nvmrc:

❯ nvm install
Found '/Users/patrick/github/patrick91/full-stack-fastapi-template/frontend/.nvmrc' with version <18.x.x>
Version '18.x.x' not found - try `nvm ls-remote` to browse available versions.

it also doesn't work with mise (a similar tool that I use), but using 18 works fine for both tools 😊

18 and 18.x.x both work for fnm 😊

[alejsdev]

Thank you! 🚀 @patrick91