[mapbox__mapbox-sdk] Fix GeocodeV6Request.proximity type

[ricardohsweiss]

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Summary

In @mapbox/mapbox-sdk/services/geocoding-v6, GeocodeV6Request.proximity is currently typed as Coordinates | "ip" where Coordinates resolves to an object shape ({ longitude, latitude, ... }) in this module.

At runtime, proximity accepts coordinate tuples ([longitude, latitude]) or "ip". This mismatch causes incorrect TypeScript errors for valid usage and forces downstream casts.

This PR updates the type to use MapiRequestCoordinates | "ip" for GeocodeV6Request.proximity, aligning the v6 request type with runtime behavior and the existing imported tuple coordinate type.

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[typescript-bot]

🔔 @jeffbdye @mikeomeara1 @chachan @techieshark @rroohhh — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.