Broken `SSLStageSuite` test suite

[danicheg]

A while ago test suite became broken – see CI runs in #768, #767, and even earlier.

==> X org.http4s.blaze.pipeline.stages.SSLStageSuite.A SSLStage in client mode should split large buffers  0.037s munit.ComparisonFailException: /home/runner/work/blaze/blaze/core/src/test/scala/org/http4s/blaze/pipeline/stages/SSLStageSuite.scala:97
96:          s + s -> false
97:        ))
98:    }

It's weird how we ended up with that, but 🤷