Conda v0.9.0 build failed

[JoeZiminski]

Due to #731 the tests started failing, which broke the conda build during release. Currently 0.9.0 is not on conda, we can either:

1. troubleshoot this and pin pytest on conda to a particular version, which may or may not be the solution. It could be something more fiddly e.g. how the runners are set up.
2. make a patch here Fix logging tests #731 and release 0.9.1 which can be the conda release.

I think (2) is simplest and there is no real downside of not having 0.9.0 not on conda?

[adamltyson]

Yeah I would go straight for 0.9.1. IMO the only compelling reason to get a specific version on conda is e.g. if it's the last version before a breaking change.