adding augur version 27.0.0

[erinyoung]

There's a new version of augur! According to the release notes there are dependency/support changes and some bug fixes.

I copied the files from 26.0.0, update the version arg, and removed some commented lines

The full diff:

$ diff augur/2{6,7}*/Dockerfile
3c3
< ARG AUGUR_VER="26.0.0"
---
> ARG AUGUR_VER="27.0.0"
34,36d33
<     #&& \
<     #cd augur-${AUGUR_VER} && \
<     #python3 -m pip install '.[full]'

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