[ssh] Apparently this is broken? (#1842)

/bin/sh seems to be sending the cd command to the background, instead of
changing directories and then running the selected command.

This has worked forever, not sure why it's failing in CI now

pwnlib/tubes/ssh.py

@@ -80,7 +80,7 @@ def __init__(self, parent, process = None, tty = False, wd = None, env = None, r
             process = context._encode(process)
 
         if process and wd:
-            process = b'cd ' + sh_string(wd) + b' &>/dev/null;' + process
+            process = b'cd ' + sh_string(wd) + b' >/dev/null 2>&1; ' + process
 
         if process and env:
             for name, value in env.items():