vim-patch:9.1.0241: filetype: mysql history files are not recognized

Problem:  filetype: mysql history files are not recognized
Solution: Detect .mysql_history as mysql
          (Wu, Zhenyu)

closes: vim/vim#14362

6b285c8cfd

Co-authored-by: Wu, Zhenyu <wuzhenyu@ustc.edu>

runtime/lua/vim/filetype.lua

@@ -1411,6 +1411,7 @@ local filename = {
   ['mplayer.conf'] = 'mplayerconf',
   mrxvtrc = 'mrxvtrc',
   ['.mrxvtrc'] = 'mrxvtrc',
+  ['.mysql_history'] = 'mysql',
   ['/etc/nanorc'] = 'nanorc',
   Neomuttrc = 'neomuttrc',
   ['.netrc'] = 'netrc',