fix: Update method failure to check IPv6 addresses.

[swanandtambe]

Closes: #1179

What's Changed

Converts IP address to string before checking for : in the address in NautobotIPAssignment class of Arista CV integration.

To Do

• Explanation of Change(s)
• Added change log fragment(s) (for more information see the documentation)
• Attached Screenshots, Payload Example
• Unit, Integration Tests
• Documentation Updates (when adding/changing features)
• Outline Remaining Work, Constraints from Design

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
nautobot_ssot/integrations/aristacv/diffsync/models
nautobot.py					305
Project Total

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