updated signature to be compatible with latest up-cpp version

[MaximilianToe]

This PR updates the signature of cleanupListener to use a const reference to be compatible with the latest version of up-cpp.

closes #25

[PLeVasseur]

Hi @MaximilianToe -- thank you for the contribution! Looks like something fell over in CI when referencing up-core-api in Conan. Could you take a look?

[PLeVasseur]

I suppose our pattern can be:

1. I spin the CI, we see what still is in need of updates, if nothing go to 4.
2. You make the update(s)
3. Go back to 1.
4. Escape loop :)

[MaximilianToe]

I fixed a few errors in the Pipeline. The only remaining errors in the CI should now originate from SocketUTransport in the up-tck repo. I made a separate PR there to update the signature and the up-cpp version. If that PR is approved, the CI here should also work.

eclipse-uprotocol/up-tck#115

[PLeVasseur]

Hey @MaximilianToe -- let's discuss in our meeting on Wednesday how to handle the up-tck failure. We need to rescope up-tck a bit in any case.

[PLeVasseur]

Thanks for clearing this up @MaximilianToe 👍