vim-patch:9.0.0182: quarto files are not recognized (#19702)

Problem:    Quarto files are not recognized.
Solution:   Recognize quarto files by the extension. (Jonas Strittmatter,
            closes vim/vim#10880)
3a9687fb27

runtime/lua/vim/filetype.lua

@@ -776,6 +776,7 @@ local extension = {
   ptl = 'python',
   ql = 'ql',
   qll = 'ql',
+  qmd = 'quarto',
   R = function(path, bufnr)
     return require('vim.filetype.detect').r(bufnr)
   end,