fix: console output when using ssh

I'm getting:

```
gpg-connect-agent: connection to the agent is in restricted mode
```

which I tracked to this invocation. Adding `--quiet` fixes it, and is probably a good idea.

modules/services/gpg-agent.nix

@@ -10,7 +10,7 @@ let
   homedir = config.programs.gpg.homedir;
 
   gpgSshSupportStr = ''
-    ${gpgPkg}/bin/gpg-connect-agent updatestartuptty /bye > /dev/null
+    ${gpgPkg}/bin/gpg-connect-agent --quiet updatestartuptty /bye > /dev/null
   '';
 
   gpgInitStr = ''
@@ -25,7 +25,7 @@ let
   gpgNushellInitStr = ''
     $env.GPG_TTY = (tty)
   '' + optionalString cfg.enableSshSupport ''
-    ${gpgPkg}/bin/gpg-connect-agent updatestartuptty /bye | ignore
+    ${gpgPkg}/bin/gpg-connect-agent --quiet updatestartuptty /bye | ignore
 
     $env.SSH_AUTH_SOCK = ($env.SSH_AUTH_SOCK? | default (${gpgPkg}/bin/gpgconf --list-dirs agent-ssh-socket))
   '';