Causalimpactx

Fix

- update pypi in actions on new tag
- fixes 43
- update to pymc5

Fix

- updated dependency in setup.cfg

Fix

- updated arviz version to avoid UnsatisfiableRequirements

Fix

- fixed error in report text + formatting

Feat

- 10 added pymc bayesian estimation

Fix

- fixes error in check for ucm_model arg
- check ucm_arg
- help flake understand unused import
- removed unused assignment