Merge tag 'sparks-3.9.1' into develop

3.9.1
Merge branch 'master' into develop
Add redshift to the global fabfile.
Enhancements and fixes to `fabric.nofabric.exists()`.
merge with master
avoid crash when Fabric is not installed.
Merge branch 'master' into release/3.9.9
version bump
Merge branch 'release/3.9.9'