Bump github.com/moby/spdystream to v0.5.1

Garret Wassermannrequested to merge
bump-moby-spdystream-051 into main

What does this MR do?

Bump github.com/moby/spdystream to v0.5.1

Why was this MR needed?

Fixes High severity CVE-2026-35469

What's the best way to test this MR?

What are the relevant issue numbers?

Merge request reports