[SDK] Explain Python version support cycle #1096

Job	Run time
integration-test (v1.29.2, none, 3.10)	16m 11s
integration-test (v1.27.11, none, 3.11)	18m 24s
integration-test (v1.28.7, none, 3.8)	16m 58s
integration-test (v1.29.2, scheduler-plugins, 3.9)	16m 56s
integration-test (v1.27.11, scheduler-plugins, 3.10)	17m 4s
integration-test (v1.28.7, scheduler-plugins, 3.11)	18m 17s
integration-test (v1.29.2, volcano, 3.8)	17m 2s
integration-test (v1.27.11, volcano, 3.9)	17m 4s
integration-test (v1.28.7, volcano, 3.10)	16m 23s
	2h 34m 19s

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