tests: update nginx to 1.25.3.

Author: zhuizhuhaomeng

.travis.yml

@@ -1,6 +1,10 @@
 sudo: required
 dist: focal
 
+branches:
+ only:
+ - "master"
+
 os: linux
 
 language: c
@@ -35,7 +39,7 @@ env:
  - TEST_NGINX_SLEEP=0.006
  - LUACHECK_VER=0.21.1
  jobs:
- - NGINX_VERSION=1.25.1
+ - NGINX_VERSION=1.25.3
 
 before_install:
  - sudo luarocks install luacheck $LUACHECK_VER