Bump spdy from 4.0.1 to 4.0.2 (#13713)

Bumps [spdy](https://github.com/indutny/node-spdy) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/indutny/node-spdy/releases)
- [Commits](https://github.com/indutny/node-spdy/commits/v4.0.2

)

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