According to statcounter, it’s about 2.48% of the PCs worldwide still using Windows 7, which are indeed very few in the global scope.
Godot has a good overall platform support, it also supports ARM32 and ARM64 versions of Windows and Linux, but I remember a comment regarding a problem with the Russian encoding in Windows 7, and I think someone else also replied to that comment with the same issue, so we have at least 2 people using Windows 7 and that is why I wanted to make this small survey :P.