python-3.9: update gitpython
This brings the possibility to check for errors on push: https://github.com/gitpython-developers/GitPython/issues/621#issuecomment-1093829991
As of 8 April 2024, the git.seco.com instance was upgraded to the Premium version. External users and SECO customers who need access to private groups or repositories can make a request by contacting SECO support team via the ticketing platform (https://support.seco.com/).
This brings the possibility to check for errors on push: https://github.com/gitpython-developers/GitPython/issues/621#issuecomment-1093829991