The debian-package-build task is now failing with this error:

E: Couldn't find these debs: python-git

Since python-git upstream has dropped support for Python 2 the Debian maintainers have dropped the python-git binary package. The solution is to switch to the python3-git package. This should most likely work by changing the package that installed and changing the python invocations in .evergreen/debian_package_build.sh over to python3.