net-mgmt/netbox: Update to 2.7.8

Changelog:

Enhancements:

• Add a "decommissioning" cable status
• Return graceful error message when webhook queuing fails
• Omit internal fields from the change log data
• Support Jinja2 templating for webhook payload and headers
• Extend custom scripts to pass the commit value via run()
• Denote rack role on rack elevations list

Bug Fixes:

• Fix exception when deleting a device with interface connections when an interfaces webhook is defined
• Escape double quotes on encapsulated values during CSV export
• Fix display of rear device image if front image is not defined
• Improve fit of device images in rack elevations
• Fix rack units filtering on elevation endpoint
• Enforce consistent background striping in rack elevations
• Fix API representation of content_type for export templates
• Fix exception when selecting all filtered objects during bulk edit
• Fix exception when filtering foreign keys by NULL
• Correct IP address hyperlinks on interface view
• Fix duplication of field attributes when multiple IPNetworkVars are present in a script
• Fix power port assignment for power outlet templates created via REST API
• Interface type should be required by API serializer

https://github.com/netbox-community/netbox/releases/tag/v2.7.8