Update Python to 3.12 and flake inputs #3935

Job	Run time
Test if testdata is up to date	3m 4s
Test (shuffled order)	3m 35s
Test + Coverage	4m 15s
Build wheel	2m 43s
Backup process	4m 12s
Formatting	2m 36s
Linter	3m 30s
Build nix environment on MacOS	3m 35s
MyPy	2m 41s
Test Typescript	2m 44s
Test Frontend	4m 16s
Install wheel with system Python	15s
	37m 26s

Provide feedback