vim-patch:9.1.0987: filetype: cake files are not recognized

Problem:  filetype: cake files are not recognized
Solution: detect '*.cake' files as cs filetype
          (Zoe Roux)

References:
https://cakebuild.net/

closes: vim/vim#16367

a407573f30

Co-authored-by: Zoe Roux <zoe.roux@zoriya.dev>

runtime/lua/vim/filetype.lua

@@ -353,6 +353,7 @@ local extension = {
   cql = 'cqlang',
   crm = 'crm',
   cr = 'crystal',
+  cake = 'cs',
   csx = 'cs',
   cs = 'cs',
   csc = 'csc',