you need to rebuild optimus-manager against the new python before reboot after the update…
aur/optimus-manager 1.4-4 (+120 0.13)
Management utility to handle GPU switching for Optimus laptops
yay -Syu optimus-manager
You will get informed on updating about the need to rebuild also:
(5/5) Checking which packages need to be rebuilt
foreign optimus-manager
foreign tlpui
foreign means it is not a repo package so it is from the AUR… there is no blinking warning about but it does inform you 
this comes with the default installed package:
Like always: Those who can read have a clear advantage! (only as a joke 
)