runtime(nginx): Update nginx syntax script

Commit: 
https://github.com/vim/vim/commit/4442ac53f7370bf7e182e19771c71e9000f123e1
Author: Chris Aumann <[email protected]>
Date:   Sun Feb 8 21:24:00 2026 +0000

    runtime(nginx): Update nginx syntax script
    
    closes: https://github.com/vim/vim/issues/19374
    
    Signed-off-by: Chris Aumann <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/nginx.vim b/runtime/syntax/nginx.vim
index b9aa85f48..e31f13971 100644
--- a/runtime/syntax/nginx.vim
+++ b/runtime/syntax/nginx.vim
@@ -1,8 +1,7 @@
 " Vim syntax file
 " Language: nginx.conf
 " Maintainer: Chris Aumann <[email protected]>
-" Last Change: Nov 25, 2023
-" 2025 Jun 08 by Vim Project: improve syntax (#17458)
+" Last Change: Jan 09, 2026
 
 if exists("b:current_syntax")
   finish
@@ -390,7 +389,6 @@ syn keyword ngxDirective proxy_buffering
 syn keyword ngxDirective proxy_buffers
 syn keyword ngxDirective proxy_busy_buffers_size
 syn keyword ngxDirective proxy_cache
-syn keyword ngxDirective proxy_cache_background_update
 syn keyword ngxDirective proxy_cache_bypass
 syn keyword ngxDirective proxy_cache_convert_head
 syn keyword ngxDirective proxy_cache_key

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