fix #52 Improve noSignal test, bump to core 3.3.0

[PyvesB]

This fixes #52 by using the new expectTimeout step verifier introduced in a recent version of reactor-core. See https://github.com/reactor/reactor-core/issues/1913 and https://github.com/reactor/reactor-core/pull/1931 for more information about this change.

[simonbasle]

thanks for the PR 🙇 self reminder that as follow-up to merging this PR I'll need to do:

• [x] rebase of techio branch and push to tech.io (no change to content)
• [x] rebase of solution branch (no change to content)