fix(systemd script): define RestartSec as 2 (#7733)

scripts/systemd/gogs.service

@@ -17,6 +17,7 @@ Group=git
 WorkingDirectory=/home/git/gogs
 ExecStart=/home/git/gogs/gogs web
 Restart=always
+RestartSec=2s
 Environment=USER=git HOME=/home/git
 
 # Some distributions may not support these hardening directives. If you cannot start the service due