Cosimo Lupo 91d7877420 ci: pin python to 3.9 for test-cython job ...

at least until scipy is not available for 3.10, or else it fails with

https://github.com/fonttools/fonttools/runs/3997161938?check_suite_focus=true#step:5:23

2021-10-25 16:33:44 +02:00

..

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ci: pin python to 3.9 for test-cython job

2021-10-25 16:33:44 +02:00