net-mgmt/netbox: Update to 3.5.6

Changelogs since 3.5.4:

Enhancements:
* Annotate VLAN group utilization
* Add "copy to clipboard" buttons in UI for IP addresses
* Add 100GE QSFP-DD interface type
* Include additional contact details on contact assignments table
* Associate contact assignments with their objects in the change log

Bug Fixes:
* Fix REST API validation of null values for several
  interface attributes
* Fix exception when clicking "create and add another" to add a cable
* Populate prechange snapshot on parent object when assigning/removing
  primary IP address
* Avoid rendering partial HTMX responses when restoring browser tabs
* Improve handling of exceptions when loading reports
* Fix LDAP group permissions assignment for API clients
* Display consistent parent information for each termination
  under cable view
* Fix designation of primary IP addresses during interface assignment
* Fix OpenAPI schema for various choice fields
* Set correct return URL for object contacts tabs
* Avoid catching database exceptions when maintenance mode is disabled
* Correct URL for VirtualDeviceContext API serializer
* Fix URL parameters for object count dashboard widgets
* Avoid erroneously clearing many-to-many assignments during bulk edit
* Fix bulk import of tags for device & module types
* Do not escape commas when rendering custom links
* Correct ASN count under ASN ranges list
* Add config_template field to device API serializer
* Allow nullifying power port max & allocated draw values
  during bulk edit
* Fix ValueError exception when searching for virtual device context
  for non-numeric values
* Fix display of last result for scripts & reports with a
  custom name defined
* Hide scheduling fields for all scripts with scheduling disabled
* Fix exception when attempting to allocate next available IP address
  from prefix marked as utilized
* Catch ProgrammingError exception when starting NetBox without
  pre-populated content types
* Exclude stale content types when retrieving changelog records

https://github.com/netbox-community/netbox/releases/tag/v3.5.6
https://github.com/netbox-community/netbox/releases/tag/v3.5.5

MFH:		2023Q3
(cherry picked from commit 14237e66)