vim-patch:9.1.0389: filetype: templ files are not recognized

Problem:  filetype: templ files are not recognized
Solution: Detect '*.templ' files as filetype templ
          (Tristan Knight)

See:
- https://github.com/a-h/templ
- https://templ.guide/

closes: vim/vim#14697

54e79157c5

Co-authored-by: tris203 <admin@snappeh.com>

runtime/lua/vim/filetype.lua

@@ -1039,6 +1039,7 @@ local extension = {
   tk = 'tcl',
   jacl = 'tcl',
   tl = 'teal',
+  templ = 'templ',
   tmpl = 'template',
   ti = 'terminfo',
   dtx = 'tex',