pin crypto in depends check (Azure#21987)

Author: scbedd

eng/tox/tox.ini

@@ -173,6 +173,7 @@ changedir = {toxinidir}
 deps =
   {[packaging]pkgs}
   requests
+  cryptography<4
 commands =
     {envbindir}/python {toxinidir}/../../../eng/tox/sanitize_setup.py -t {toxinidir}
     {envbindir}/python {toxinidir}/../../../eng/tox/create_package_and_install.py \