www/nginx-devel: security update from 1.27.5 to 1.28.0

<ChangeLog>

*) 1.28.x stable branch.

*) Bugfix: nginx could not be built by gcc 15 if ngx_http_v2_module or

ngx_http_v3_module modules were used.

*) Bugfix: nginx might not be built by gcc 14 or newer with -O3 -flto

optimization if ngx_http_v3_module was used.

</ChangeLog>