chore: use context properties where context methods are deprecated

[filiptammergard]

But keep supporting the methods for now.

I think this might be considered a chore as it won't affect users of the plugin until ESLint v10 is released.

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[BPScott]

Generally yes and thanks! I'll test this with old and new eslint versions and merge if it all looks good over the weekend

[BPScott]

Thanks! I pushed up a tweak to the comments, to avoid having long lines - I prefer comments living above code rather than at the end of a code line

[filiptammergard]

Great @BPScott ⭐