feat(propsys): add constant for Product Version property (#2634)

Author: who-dat-sew

com/win32comext/propsys/pscon.py

@@ -781,6 +781,7 @@
 PKEY_Shell_SFGAOFlagsStrings = (IID("{D6942081-D53B-443D-AD47-5E059D9CD27A}"), 2)
 PKEY_Software_DateLastUsed = (IID("{841E4F90-FF59-4D16-8947-E81BBFFAB36D}"), 16)
 PKEY_Software_ProductName = (IID("{0CEF7D53-FA64-11D1-A203-0000F81FEDEE}"), 7)
+PKEY_Software_ProductVersion = (IID("{0CEF7D53-FA64-11D1-A203-0000F81FEDEE}"), 8)
 PKEY_Sync_Comments = (IID("{7BD5533E-AF15-44DB-B8C8-BD6624E1D032}"), 13)
 PKEY_Sync_ConflictDescription = (IID("{CE50C159-2FB8-41FD-BE68-D3E042E274BC}"), 4)
 PKEY_Sync_ConflictFirstLocation = (IID("{CE50C159-2FB8-41FD-BE68-D3E042E274BC}"), 6)