Bump nginx version for CI

Author: davidjb

.travis.yml

@@ -5,8 +5,8 @@ compilers:
 env:
   # Don't use `NGINX` as the variable name or Nginx won't daemonise
   # Mainline
-  - SHIB_NGINX_VERSION=1.21.0 SHIB_DYNAMIC_MODULE=true
-  - SHIB_NGINX_VERSION=1.21.0 SHIB_DYNAMIC_MODULE=false
+  - SHIB_NGINX_VERSION=1.21.1 SHIB_DYNAMIC_MODULE=true
+  - SHIB_NGINX_VERSION=1.21.1 SHIB_DYNAMIC_MODULE=false
   # Stable
   - SHIB_NGINX_VERSION=1.20.1 SHIB_DYNAMIC_MODULE=true
   - SHIB_NGINX_VERSION=1.20.1 SHIB_DYNAMIC_MODULE=false