fix: nb_lookup plugin: Allow mac-addresses lookup

[shaderecker]

Related Issue

New Behavior

Add possibility to query mac-addresses with the nb_lookup plugin for NetBox 4.2+

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Contrast to Current Behavior

Feature is missing so far

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Discussion: Benefits and Drawbacks

• mac-addresses was added in Netbox 4.2 so we need to follow the feature set
• No drawbacks
• The mac-addresses feature wasn't available in Netbox versions lower than 4.2 so it won't impact those.

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Changes to the Documentation

n/a

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Proposed Release Note Entry

nb_lookup plugin - Allow mac-addresses lookup

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Double Check

• I have read the comments and followed the CONTRIBUTING.md.
• I have explained my PR according to the information in the comments or in a linked issue.
• My PR targets the devel branch.

[sc68cal]

I believe this needs to check the API version before adding to netbox_endpoint_map - because we still support 4.1 where this API is not available.

There are lots of examples of this, below the line that you have added.