feature: update nginx to v1.27.1.

Author: zhuizhuhaomeng

.travis.yml

@@ -44,8 +44,8 @@ env:
     - TEST_NGINX_SLEEP=0.006
   matrix:
     #- NGINX_VERSION=1.21.4 OPENSSL_VER=1.1.12
-    - NGINX_VERSION=1.27.0 OPENSSL_VER=1.1.1w
-    - NGINX_VERSION=1.27.0 OPENSSL_VER=1.1.1w USE_PCRE2=Y
+    - NGINX_VERSION=1.27.1 OPENSSL_VER=1.1.1w
+    - NGINX_VERSION=1.27.1 OPENSSL_VER=1.1.1w USE_PCRE2=Y
 
 services:
  - memcache