vim-patch:8.2.4767: openscad files are not recognized (#18138)

Problem:    Openscad files are not recognized.
Solution:   Add a filetype pattern. (Niklas Adam, closes vim/vim#10199)
c360b2566c

runtime/lua/vim/filetype.lua

@@ -436,6 +436,7 @@ local extension = {
   xin = "omnimark",
   opam = "opam",
   ["or"] = "openroad",
+  scad = "openscad",
   ora = "ora",
   org = "org",
   org_archive = "org",