Can I update my ipad using a lenovo computer

You’ll need access to either a PC (with iTunes installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of MacOS).

Download and use iTunes for Windows – Apple Support

Update software on iPhone, iPad or iPod touch in iTunes on PC - Apple Support

Yes. It might be a Windows PC running iTunes, or a Mac running iTunes/Finder.

Regards

Giulio