net-mgmt/netbox: Update to 2.9.8

• Limit the version ranges of the required Python packages and use very narrow ranges for those ones, which often cause regressions.
  
  That is because upstream already uses fixed Python package dependencies for a while and had relaxed them for a short period of time.
  
  However, because it led to regressions when some Python packages were updated during that time, upstream has been using fixed package dependencies again since then.

Changelog since 2.7.12:

It contains many bugfixes/enhancements and the following new features:

• Object-Based Permissions
• Background Execution of Scripts & Reports
• Named Virtual Chassis
• Changes to Tag Creation
• Dedicated Model for VM Interfaces
• REST API Endpoints for Users and Groups
• Remote Authentication Support
• Plugins

https://github.com/netbox-community/netbox/blob/v2.8.9/docs/release-notes/version-2.9.md
https://github.com/netbox-community/netbox/blob/v2.8.9/docs/release-notes/version-2.8.md