gitea.service: Remove syslog.target (#29550)

Remove syslog.target from service file, this target hasn't existed for
over a decade.


6aa8d43ade/NEWS (L72-L73)

contrib/systemd/gitea.service

@@ -1,6 +1,5 @@
 [Unit]
 Description=Gitea (Git with a cup of tea)
-After=syslog.target
 After=network.target
 ###
 # Don't forget to add the database service dependencies