duplicity 0.8.09

[middagj]

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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Upgrade to 0.8.09. I downgraded dropbox to 6.9.0 (again). The reason is that it is explicitly locked to that version in the source. Apart form that, the source now uses b2sdk instead of b2 and boto3 (next to boto which is now deprecated). I updated the poet command to reflect these changes.

I also upgraded to Python3 as part of #47274. The 0.8 branch is Python 3 ready.

[fxcoudert]

Note python is already Python 3.7
But upgrading to 3.8 should be fine. @bayandin is that OK with you?

[bayandin]

But upgrading to 3.8 should be fine. @bayandin is that OK with you?

Nothing with python depends on duplicity and it got installed into venv, so it should be ok.