v7.4.0

[arthanson]

Getting caught up on the backlog - added NetBox 4.0 to the testing matrix so starting support for it, will have to go through the APIs and updated them as required in a follow-on update.

What's Changed

• Fix: pynetbox greater than 7.0.0 fails to insert complex custom_fields. Fixes pynetbox greater than 7.0.0 fails to insert complex custom_fields #597 by @costasd in flatten_custom: return dict if id is not present #598
• Fix: replace None with 'null' in query parameters. by @doc-sheet in replace None with 'null' in query parameters #545
• Fix: Fixes for connected endpoints. by @abhi1693 in Fixes for connected endpoints #578
• Added first support for NetBox 4.0
• Removed python 3.8, 3.9 from testing matrix, added python 3.12
• Removed NetBox 3.4, 3.5 from testing matrix, added NetBox 4.0
• Added readme compatibility matrix.

Full Changelog: v7.3.4...v7.4.0