security/py-netmiko: Update to 2.4.1

Changelog:

Enhancements:

• Add Genie/pyATS parser support

Bugfixes:

• Fix Huawei telnet login
• Fix support for TextFSM >= 1.0.0
• Fixes on Mellanox Driver

https://github.com/ktbyers/netmiko/releases/tag/v2.4.1