New target property for specifying Python version #3129

Job	Run time
check-diff / check	19s
serialization / serialization-tests	7m 41s
py / py-tests / regular-tests (ubuntu-latest)	17m 3s
c / benchmarking / benchmark-tests	7m 30s
c / default / regular-tests (ubuntu-latest)	26m 7s
c / ccpp / regular-tests (ubuntu-latest)	22m 47s
c / verifier / run (ubuntu-latest)	5m 46s
cpp / cpp-benchmark-tests / benchmark-tests	11m 44s
cpp / cpp-tests / regular-tests (ubuntu-latest)	50m 12s
rs / rs-benchmark-tests / benchmark-tests	16m 19s
cpp / cpp-ros2-tests / cpp-ros2-tests	42m 49s
ts / benchmarking / benchmark-tests	4m 16s
rs / rs-tests / regular-tests (ubuntu-latest, stable)	8m 37s
ts / ts-tests / regular-tests (ubuntu-latest)	20m 16s
	4h 1m 26s

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