textproc/py-ntc-templates: Update to 7.1.0

* Re-add the tweak of 873eee30 for the existing patch so that it
  also contains the current version.

Changelogs since 6.0.0:

https://github.com/networktocode/ntc-templates/releases/tag/v7.1.0
https://github.com/networktocode/ntc-templates/releases/tag/v7.0.0