bump: compatible with Lightning v2

[lannelin]

What does this PR do?

Bumps to lightning 2 as per #1067

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📚 Documentation preview 📚: https://lightning-bolts--1094.org.readthedocs.build/en/1094/

[lannelin]

I believe that some of the checks are failing for reasons unrelated to changes in this PR e.g. "Roms.rar is not RAR archive" in ubuntu-20.04, 3.8, latest.

I also haven't updated documentation as unsure where would be best to do so for this change.

[Borda]

Pls add description, I guess you try to bump dependency to lightning v2, right?

[lannelin]

Pls add description, I guess you try to bump dependency to lightning v2, right?

Yes, sorry! I've updated it now.