Log Message:
*/*unit*: update NGINX Unit from 1.27.0 to 1.28.0

<ChangeLog>

*) Change: increased the applications' startup timeout.

*) Change: disallowed abstract Unix domain socket syntax in non-Linux
   systems.

*) Feature: basic statistics API.

*) Feature: customizable access log format.

*) Feature: more HTTP variables support.

*) Feature: forwarded header to replace client address and protocol.

*) Feature: ability to get dynamic variables.

*) Feature: support for abstract Unix sockets.

*) Feature: support for Unix sockets in address matching.

*) Feature: the $dollar variable translates to a literal "$" during
   variable substitution.

*) Bugfix: router process could crash if index file didn't contain an
   extension.

*) Bugfix: force SCRIPT_NAME in Ruby to always be an empty string.

*) Bugfix: when isolated PID numbers reach the prototype process host
   PID, the prototype crashed.

*) Bugfix: the Ruby application process could crash on SIGTERM.

*) Bugfix: the Ruby application process could crash on SIGINT.

*) Bugfix: mutex leak in the C API.

</ChangeLog>