[python-committers] How to retry backport?

https://github.com/python/cpython/pull/8745

This failed (I think travis, but can't tell now). I thought I could close it and re-open it to get it to retry, but apparently not. When I closed it, the backport branch was deleted. At this stage, how do I get the backport to try again?

I have spotty internet access, so it might take me a while to try this again.

Thanks.

Eric