This PS updates python modules and code to match Airflow 2.6.2:
- bionic py36 gates were removed
- python code corrected to match new modules versions
- selection of python modules versions was perfrmed based on
airflow-2.6.2 constraints
- postgresql image updated to 14.8
Change-Id: Ibdcc75e600166c20b842508aa5539587cca466f0