Add precip unit conversion to clean-cmip6, pin dev steps to v0.4.0 release

[brews]

This PR changes the CMIP6 cleaning workflow so that it checks precipitation units and performs a basic unit conversion if needed.

This PR also takes Argo workflow stages using dodola's floating dev tag and pins them to use the recent v0.4.0 release. This should keep the stages from unintentionally breaking from package updates, etc. in the container.

[brews]

Ran this through a workflow to test things out.
The ERA5 cleaning workflow was clean-era5-dev-8v77n. It ran without issue.

The CMIP6 cleaning workflow was clean-cmip6-dev-l6x8n. It's hitting an out-of-memory error when cleaning precipitation. Specifically, it hits the standardize-cmip6 template and running dodola cleancmip6 ... (using downscalecmip6.azurecr.io/dodola:0.4.0) and this leads it to run out of memory.

Seems like the dodola cleancmip6 in the v0.4.0 update has most (or all) of the zarr store read into memory at once when the precip data undergoes its unit conversion, @dgergel.

I don't think it's a change in the input data because the raw data is unchanged from the last time we ran a clean-cmip6 workflow step.

[brews]

Okay, got this running with the latest commits (see workflow clean-cmip6-dev-4hpkz for successful run). Just needed to bump memory requests a bit for precipitation cleaning steps. 👍