Hi,
All the plugins and modules included by default in HikaShop 4.7.1 (and since many releases ago) are fully compatible with Joomla 4. And they update automatically when you update HikaShop.
So you can ignore what Joomla says for them, the automated thing in Joomla just doesn't know.
Note however that all the plugins and modules compatible with HikaShop you installed next to it are not concerned by what I'm saying here.
If you installed a payment plugin from a third party developer (or even the plugins from our marketplace) and you're not up to date with it, or the plugin is not compatible with Joomla 4 yet, it's totally possible it will break HikaShop pages after the migration.
The best would be to make a copy of the website and try the migration process on the copy first to make sure the most important things still work fine.