runtime(html): bump length of character references in syntax script (#15022)

Commit: 
https://github.com/vim/vim/commit/917ff8a19d2746dd922b7292dc61fb92e18b7ce2
Author: Mohamed Akram <mohd.ak...@outlook.com>
Date:   Sun Jun 16 18:47:36 2024 +0400

    runtime(html): bump length of character references in syntax script 
(https://github.com/vim/vim/issues/15022)
    
    This allows handling longer references such as
    `&CounterClockwiseContourIntegral;`.
    
    Signed-off-by: Mohamed Akram <mohd.ak...@outlook.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/syntax/html.vim b/runtime/syntax/html.vim
index c975ae862..d067dde83 100644
--- a/runtime/syntax/html.vim
+++ b/runtime/syntax/html.vim
@@ -191,7 +191,7 @@ syn keyword htmlArg contained step title translate 
typemustmatch
 syn match   htmlArg contained "\<data-\h\%(\w\|[-.]\)*\%(\_s*=\)\@="
 
 " special characters
-syn match htmlSpecialChar "&#\=[0-9A-Za-z]\{1,8};"
+syn match htmlSpecialChar "&#\=[0-9A-Za-z]\{1,32};"
 
 " Comments (the real ones or the old netscape ones)
 if exists("html_wrong_comments")

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