vim-patch:9.1.0536: filetype: zone files are not recognized

Problem:  filetype: zone files are not recognized
          (rpdprd)
Solution: Detect '*.zone' files as bindzone filetype

fixes: vim/vim#14222

f095539b39

Co-authored-by: Christian Brabandt <cb@256bit.org>

runtime/lua/vim/filetype.lua

@@ -236,6 +236,7 @@ local extension = {
   db = detect.bindzone,
   bicep = 'bicep',
   bicepparam = 'bicep',
+  zone = 'bindzone',
   bb = 'bitbake',
   bbappend = 'bitbake',
   bbclass = 'bitbake',