test: update nginx to 1.27.1.

Author: zhuizhuhaomeng

.travis.yml

@@ -25,8 +25,8 @@ env:
     - LUAJIT_INC=$LUAJIT_PREFIX/include/luajit-2.1
     - LD_LIBRARY_PATH=$LUAJIT_LIB:$LD_LIBRARY_PATH
   matrix:
-    - NGINX_VERSION=1.21.4
     - NGINX_VERSION=1.25.3 WITHOUT_PCRE2=1
+    - NGINX_VERSION=1.27.1 WITHOUT_PCRE2=1
 
 before_install:
   - sudo apt-get update -y