runtime(kconfig): Update syntax script and remove syn sync

fixes: #15306

Signed-off-by: Christian Brabandt <[email protected]>

Author: chrisbra

runtime/syntax/kconfig.vim

@@ -1,7 +1,7 @@
 " Vim syntax file
 " Maintainer:           Christian Brabandt <[email protected]>
 " Previous Maintainer:  Nikolai Weibull <[email protected]>
-" Latest Revision:      2015-05-29
+" Latest Revision:      2024-07-19
 " License:              Vim (see :h license)
 " Repository:		https://github.com/chrisbra/vim-kconfig
 
@@ -715,8 +715,6 @@ syn region  kconfigHelpText
       \ skip='^$'
       \ end='^\z1\@!'
 
-syn sync    match kconfigSyncHelp     grouphere kconfigHelpText 'help\|---help---'
-
 hi def link kconfigTodo         Todo
 hi def link kconfigComment      Comment
 hi def link kconfigKeyword      Keyword