py: ci: pin python version #168

Job	Run time
test-python-sdk-test (latest, 3.13)	1m 38s
test-typescript-ccda-example (latest)	22s
test-csharp-sdk (latest, 8.0.x)	1m 23s
test-typescript-sdk-r4 (latest)	19s
	3m 42s

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