net-mgmt/netbox: Update to 3.6.8

• Prune specific update instructions for releases older than 3.2 while I'm here.

Changelog:

Enhancements:

• List parent prefixes under IP range view
• Print new NetBox version when running upgrade script
• Add the available_at_site filter for VLANs
• Match against description field when searching for devices

Bug Fixes:

• Correct display of error message when attempting invalid VLAN site & group assignment
• Fix custom validation for many-to-many fields
• Fix filtering custom multi-choice fields by null
• Correct calculation of absolute lengths for zero-length cables
• Update status of remote data source when syncing fails via syncdatasource management command
• Fix cloning of objects which have a multi-choice custom field
• Ensure reservations tab is always displayed under rack view
• Device/VM change record should accurately reflect when primary/OOB IP is deleted
• Fix association of job results when executing scripts via runscript management command
• Do not escape exclamation marks in custom link URLs
• Fix display of the tags column under VDC table
• Fix display of current configuration parameters in UI

https://github.com/netbox-community/netbox/releases/tag/v3.6.8

MFH: 2023Q4
(cherry picked from commit 426da115bce9dcbc7945289c17ded11aa77934d2)