fix(ntfy tests): Tweak timeouts a bit

configuration/services/ntfy-sh/default.nix

@@ -137,17 +137,17 @@ in
                 "curl",
                 "--silent",
                 "--show-error",
-                f"--max-time {timeout}",
+                f"--max-time {2 + timeout}",
                 "-u tlater:insecure",
                 f"http://ntfy.testHost/{topic}/json",
-                "> messages"
+                "-o messages"
             ]
 
             client.succeed(f'{" ".join(systemd_invocation)} "{" ".join(curl)}"')
 
             # Give some slack so the host doesn't send messages before
             # we're listening
-            time.sleep(1)
+            time.sleep(2)
 
             yield