Pin python version to 3.10 #233

Job	Run time
Generate build matrix	6s
build-and-push-arena-images (images/base, base-on3.10-bullseye, on=3.10-bullseye)	1m 38s
build-and-push-arena-images (images/base, base-on3.9-bullseye, on=3.9-bullseye)	1m 30s
build-and-push-arena-images (images/base, base-on3.7-bullseye, on=3.7-bullseye)	1m 40s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.10-bullseye, on=3.10-bullseye)	25m 55s
build-and-push-arena-images (images/ray_rllib, ray-rllib-on3.9-bullseye, on=3.9-bullseye)	25m 35s
build-and-push-arena-images (images/stable-baselines, stable-baselines-on3.7-bullseye, on=3.7-bul...	6m 23s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.10-bullseye, on=3.10...	20m 32s
build-and-push-arena-images (images/stable-baselines3, stable-baselines3-on3.9-bullseye, on=3.9-b...	20m 52s
	1h 44m 11s

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