update requirements, remove deprecated Windows support

fyi @deepak1556 @timheuer

docs/supporting/requirements.md

@@ -21,7 +21,7 @@ We recommend:
 
 VS Code is supported on the following platforms:
 
-* Windows 8.0, 8.1 and 10, 11 (32-bit and 64-bit)
+* Windows 10 and 11 (32-bit and 64-bit)
 * OS X High Sierra (10.13+)
 * Linux (Debian): Ubuntu Desktop 16.04, Debian 9
 * Linux (Red Hat): Red Hat Enterprise Linux 7, CentOS 7, Fedora 34