Build: Bump tornado from 6.5.5 to 6.5.6 (#3480) #8880

Job	Run time
integration-test	11m 0s
cibw-dev-env-smoke-test	41s
lint-and-unit-test (3.12)	3m 17s
integration-test-gcs	1m 24s
lint-and-unit-test (3.13)	3m 17s
lint-and-unit-test (3.14)	5m 16s
lint-and-unit-test (3.10)	3m 24s
lint-and-unit-test (3.11)	3m 12s
integration-test-adls	1m 30s
integration-test-s3	1m 20s
integration-coverage-report	31s
	34m 52s

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