runtime(sh) Update sh syntax and add shDblParen to shCaseList (#13469)

Commit: 
https://github.com/vim/vim/commit/1858e2b22ad168b1fd44a4efcd3a2b6cd9f6772d
Author: Lucien Grondin <[email protected]>
Date:   Thu Nov 2 20:33:56 2023 +0100

    runtime(sh) Update sh syntax and add shDblParen to shCaseList 
(https://github.com/vim/vim/issues/13469)
    
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index d64c3a9b0..0fb10f0e5 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -140,7 +140,7 @@ syn cluster shArithList     
contains=@shArithParenList,shParenError
 syn cluster shCaseEsacList     
contains=shCaseStart,shCaseLabel,shCase,shCaseBar,shCaseIn,shComment,shDeref,shDerefSimple,shCaseCommandSub,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote,shCtrlSeq,@shErrorList,shStringSpecial,shCaseRange
 syn cluster shCaseList 
contains=@shCommandSubList,shCaseEsac,shColon,shCommandSub,shCommandSubBQ,shComment,shDblBrace,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq
 if exists("b:is_kornshell") || exists("b:is_bash")
- syn cluster shCaseList        add=shForPP
+ syn cluster shCaseList        add=shForPP,shDblParen
 endif
 syn cluster shCommandSubList   
contains=shAlias,shArithmetic,shCmdParenRegion,shCommandSub,shComment,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shEcho,shEscape,shExDoubleQuote,shExpr,shExSingleQuote,shHereDoc,shNumber,shOperator,shOption,shPosnParm,shHereString,shRedir,shSingleQuote,shSpecial,shStatement,shSubSh,shTest,shVariable
 syn cluster shCurlyList        
contains=shNumber,shComma,shDeref,shDerefSimple,shDerefSpecial

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