Log Message:
py-poetry-core: Request that this not be updated to 1.3.x

Upstream has a breaking change that causes synapse to fail.  synapse
has added a pinned dependency, which will need to be patched out, but
the build will fail with 1.3.x.  Given the nature of the change in
dependency processing rules, it seems likely that other poetry-using
projects are going to have problems too.