Pin winit fix for X11 attention send crash

[warp-agent-staging]

Description

On Linux/X11, a disconnected display can make request_user_attention panic during terminal bell handling. Pin Warp to the winit fix so a failed hints send no longer aborts the client; successful sends still ignore the cookie.

Linked Issue

Sentry: WARP-CLIENT-BETA-STABLE-89S1. No GitHub issue was supplied.

• The linked issue is labeled ready-to-spec or ready-to-implement — not a GitHub issue.
• Where appropriate, screenshots or a short video of the implementation are included below — no UI presentation change.

Testing

• The upstream Xvfb regression test passed after failing on the original panic; 8 winit library tests passed.
• cargo metadata --locked resolved both winit and dpi from the new published commit.
• cargo clippy --locked -p winit -- -D warnings passed using Warp's resolved dependency.
• ./script/format completed.
• I have manually tested my changes locally with ./script/run — the disconnected X11 path was exercised by the upstream regression test instead.

Agent Mode

• Warp Agent Mode — created by Warp Factory, not Agent Mode.

CHANGELOG-BUG-FIX: Avoid crashing when the Linux X11 server disconnects during an attention request.

Plans:

• Recover from X11 attention send failures and update Warp’s winit pin

[warp-agent-staging]

This PR was generated with Warp.

Comment @warp-staging-factory on this PR to send it follow-up work.