Add proxy update

[AHarmlessPyro]

Note

Low Risk
Low risk: adds a new SDK method and types for updating session proxy settings without altering existing request flows beyond an additional type: "proxy" update call.

Overview
Adds SessionsService.updateProxyParams(id, params) to send PUT /session/{id}/update with { type: "proxy", params }, enabling runtime updates to proxy enablement, static IP selection, and optional location targeting.

Exposes new types UpdateSessionProxyParams and UpdateSessionProxyLocationParams from src/types/session.ts via the public types index, and bumps the package version to 0.87.0.

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