vim-patch:9.0.1256: NetworkManager connection files are not recognized (#22038)

Problem:    NetworkManager connection files are not recognized.
Solution:   Add a pattern for NetworkManager connection files. (closes vim/vim#11893)

04e4f1d985

Co-authored-by: ObserverOfTime <chronobserver@disroot.org>

runtime/lua/vim/filetype.lua

@@ -226,6 +226,7 @@ local extension = {
   hook = function(path, bufnr)
     return M.getlines(bufnr, 1) == '[Trigger]' and 'conf'
   end,
+  nmconnection = 'confini',
   mklx = 'context',
   mkiv = 'context',
   mkii = 'context',