[libc++][NFC] Resolve Python 2 FIXME

We don't use Python 2 anymore, so let us do the recommended fix instead
of using the workaround made for Python 2.

Differential Revision: https://reviews.llvm.org/D107715

NOKEYCHECK=True
GitOrigin-RevId: f46f93b4786377dd7ee704ef2beedadfe4f05adf
diff --git a/utils/ssh.py b/utils/ssh.py
index d6346fc..6c1d706 100755
--- a/utils/ssh.py
+++ b/utils/ssh.py
@@ -23,11 +23,7 @@
 import tarfile
 import tempfile
 
-try:
-   from shlex import quote as cmd_quote
-except ImportError:
-   # for Python 2 compatibility
-   from pipes import quote as cmd_quote
+from shlex import quote as cmd_quote
 
 def ssh(args, command):
     cmd = ['ssh', '-oBatchMode=yes']