Bug#1057847: tombo: FTBFS with Python 3.12

[Nilesh Patra]

On Sat, 09 Dec 2023 16:18:35 +0100 Bas Couwenberg  wrote:
> It builds successfully when using cython 3.0 from experimental.

Hence there's nothing we could do except for waiting for cython upload to 
unstable.

Best,
Nilesh