ci: fix Python dependency on Ubuntu 24.04

Newer versions of Ubuntu have dropped Python 2 starting with Ubuntu 23.04. By default though, our CI setups will try to use that Python version on all Ubuntu-based jobs except for the "linux-gcc" one. We didn't notice this issue due to two reasons: - The "ubuntu:latest" tag always points to the latest LTS release. Until a few weeks ago this was Ubuntu 22.04, which still had Python 2. - Our Docker-based CI jobs had their own script to install dependencies until 9cdeb34b96 (ci: merge scripts which install dependencies, 2024-04-12), where we didn't even try to install Python at all for many of them. Since the CI refactorings have originally been implemented, Ubuntu 24.04 was released, and it being an LTS versions means that the "latest" tag now points to that Python-2-less version. Consequently, those jobs that use "ubuntu:latest" broke. Address this by using Python 2 on Ubuntu 20.04, only, whereas we use Python 3 on all other Ubuntu jobs. Eventually, we should think about dropping support for Python 2 completely. Reported-by: Justin Tobler <jltobler@gmail.com> Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>