net-mgmt/netbox: Update to 3.7.1

* Expand the filter for find(1) to prevent the installation of backups
  of patched files while I'm here.

Changelog:

Bug Fixes:
* Use available_at_site filter when filtering VLANs under prefix form
* Fix tunnel creation when setting initial termination to a VM interface
* Relax one-to-one mapping of tunnel termination to IP address
* Fix typo in tunnel termination type choice name
* Remove errant translation wrapper from installed_device on DeviceBay
* Custom field API serializer should accept null values for all
  optional fields
* Hide available prefixes when searching within a parent prefix
* Add missing Diffie-Hellman group 15
* Ensure default contact assignment ordering is consistent
* Relax required fields for IKE & IPSec models on bulk import
* Ensure all matching event rules are processed in response to an event

https://github.com/netbox-community/netbox/releases/tag/v3.7.1