www/nginx-devel: update from 1.19.9 to 1.19.10.

<Changelog>

*) Change: the default value of the "keepalive_requests" directive was
   changed to 1000.

*) Feature: the "keepalive_time" directive.

*) Feature: the $connection_time variable.

*) Workaround: "gzip filter failed to use preallocated memory" alerts
   appeared in logs when using zlib-ng.

</Changelog>