vim-patch:9.0.0566: Nim files are not recognized (#20317)

Problem:    Nim files are not recognized.
Solution:   Add patterns for Nim files. (Nbiba Bedis, closes vim/vim#11205)
9fd1583c83

runtime/lua/vim/filetype.lua

@@ -704,6 +704,9 @@ local extension = {
   nanorc = 'nanorc',
   ncf = 'ncf',
   nginx = 'nginx',
+  nim = 'nim',
+  nims = 'nim',
+  nimble = 'nim',
   ninja = 'ninja',
   nix = 'nix',
   nqc = 'nqc',