You can use Ripper's script here to check your modules.
Foundry VTT
This script looks awesome!! thank you will check it out! :)
I still have to upgrade Foundry instance, so I haven't really checked it so far. What I did last time was to make a full backup from the data on the server, and use that backup on locally on my pc with a local server. Then you can safely run the update there, check if everything is working and fix what is not working. This is especially useful if you are running custom modules.
Foundry also announced that they will make this process easier with Version 11.5. There will be an interface that will show if the systems and modules you are running are compatible with the new version and will also show if there are updates available to make them compatible with the new version. So maybe it is not a bad idea to wait for this update.
Thanks as I'm in the middle of a campaign I hesitate every upgrade but I really like them for the new features. I'll probably run the script that @RebelMage suggested and see the state of things and then wait for 11.5.