net-mgmt/netbox: Update to 2.11.12

Changelog:

Enhancements:

• Add site group filter to devices list
• Recognize a /32 IPv4 address as a child of a /32 IPv4 prefix
• Add table configuration button to child prefixes view
• Introduce LOGIN_PERSISTENCE configuration parameter to persist user sessions
• Add search field to VM interfaces filter form

Bug Fixes:

• Model forms should save empty custom field values as null
• Enable filtering assigned VLANs by group in interface edit form
• Force assignment of null custom field values to objects
• Fix erroneous webhook dispatch on failure to save objects
• Show contextual label for IP address role
• Fix hidden "add components" dropdown on devices list

https://github.com/netbox-community/netbox/releases/tag/v2.11.12