www/nginx: Fix nginx with LUA after lua-resty-core update

In f08bfacc8fd6 lua-resty-core was updated this requires an updated
version of openresty-lua-nginx-module.

To prevent further people from bricking their nginx update the
openresty-lua-nginx-module 3rd party module to 0.10.26.

Otherwise people will find an nginx that does not start anymore with
the following error message:

nginx: [alert] failed to load the 'resty.core' module
(https://github.com/openresty/lua-resty-core); ensure you are using an
OpenResty release from https://openresty.org/en/download.html (reason:
/usr/local/share/lua/5.1/resty/core/base.lua:24: ngx_http_lua_module
0.10.26 required) in /usr/local/etc/nginx/nginx.conf:1044

PR: 277145
Approved by: portmgr (blanket, just fix it)