Keep After=network.target in Puma systemd unit

We keep After=network.target instead of the new default
After=syslog.target network.target introduced in capistrano3-puma 6.0.0.

Our Puma service doesn't depend on syslog availability because it writes
logs directly to files using:

> StandardOutput=append:...
> StandardError=append:...

So the syslog.target dependency is unnecessary in our case.

lib/capistrano/templates/puma.service.erb

@@ -12,7 +12,7 @@
 [Unit]
 Description=Puma HTTP Server for <%= "#{fetch(:application)} (#{fetch(:stage)})" %>
 <%= "Requires=#{fetch(:puma_service_unit_name)}.socket" if fetch(:puma_enable_socket_service) %>
-After=syslog.target network.target
+After=network.target
 
 [Service]
 Type=<%= service_unit_type %>