Feature/minimum python version 3.9
As stated here: !4 (comment 2633787) Python version 3.7 and soon 3.8 will reach their end-of-life. This MR removes support for them.
As stated here: !4 (comment 2633787) Python version 3.7 and soon 3.8 will reach their end-of-life. This MR removes support for them.