How do I get the newest version of Safari?

Hello ~ You would simply update your iPad. Take a look here:

Update your iPhone, iPad, or iPod touch - Apple Support

~Katana-San~

Hello ~ Take a look here and update your device:

Update your iPhone, iPad, or iPod touch - Apple Support

~Katana-San~

Hello. Safari updates along with iPadOS. If you would like to get the latest version of Safari, you will need to upgrade to iPadOS 15.