Bug: this line should be calling `sslHandshake`

[bryce-anderson]

https://github.com/http4s/blaze/blob/c87ff657dc49fd68267ec70faf0389260f988104/core/src/main/scala/org/http4s/blaze/pipeline/stages/SSLStage.scala#L329

I think this isn't ever hit in practice as the handshake happens almost universally in the syncWrite path and the read path.