Update netbox version to 3.0.7

[rsp2k]

No description provided.

[lae]

Hi. Thanks for your PR.

Have you gotten a chance to review #132 and if so, can you confirm that you've read through the changelogs for NetBox up until the current release to ensure that any new configuration changes/features are accounted for in this changeset?

[rsp2k]

I've gone through the changelogs, the only thing I found is a new daily "housekeeping" cron job that I've added to my fork.

[lae]

So I quickly tried to validate for myself and read through the changes from 2.9.9 to 2.10.10 (so there might still be stuff missing for 2.11.x and 3.0.x), and found these two that affect this role:
netbox-community/netbox#5938 (which we already have an issue for, #127, and I guess #125 is also of concern)
netbox-community/netbox#6083 (see associated PR for details)

I also realised I could quickly do a diff on some files to help pinpoint configuration changes and upgrade.sh changes from 2.9.9 to current:

https://gist.github.com/lae/a24a0bc366e76626ff65f48c9ed32319

On a quick skim most of the config file changes look superficial and so the only thing that could probably use an update is the example at examples/netbox_config.yml. The redis change (the second PR mentioned above) is done in the config template/with role variables. One of the upgrade changes already has a PR at #124 that I guess I need to go back to later.