update our dependency stack

summary:

• python updated to 3.9
• dask no longer held back to 2.3.0-or-earlier
• lmatools/stormdrain/glmtools all pinned to current latest versions

seems to be working, but TODO:

• run regression tests (& especially satpy hang test) with this dependency stack before merging

assigned to @nickb

changed the description

marked the checklist item run regression tests (& especially satpy hang test) with this dependency stack before merging as completed

satpy hang test ran with no issues on espresso. Other tests there also passed, though they still don't compare the output vs a known truth. Seems good enough to merge.

closed

reopened

merged

mentioned in commit 43ba125d