Bump github.com/moby/spdystream from 0.5.0 to 0.5.1 (#7086)

Bumps [github.com/moby/spdystream](https://github.com/moby/spdystream) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/moby/spdystream/releases)
- [Commits](https://github.com/moby/spdystream/compare/v0.5.0...v0.5.1)

---
updated-dependencies:
- dependency-name: github.com/moby/spdystream
  dependency-version: 0.5.1
  dependency-type: indirect
...

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