Bump tornado from 6.4.1 to 6.4.2 #1030

Job	Run time
get_exasol_versions / get_exasol_versions	13s
Run all tests for Exasol 8.31.0	15s
Run all tests for Exasol 8.25.0	17s
Run all tests for Exasol 7.1.25	16s
Run all tests for Exasol 7.1.11	17s
Run all tests for Exasol 7.1.2	17s
Run all tests for Exasol 7.1.26	19s
Run all tests for Exasol 7.1.7	14s
Run all tests for Exasol 8.18.1	19s
Run all tests for Exasol 8.23.1	20s
Run all tests for Exasol 7.1.18	22s
Run all tests for Exasol 7.1.29	24s
Run all tests for Exasol 7.1.9	15s
Run all tests for Exasol 7.1.22	18s
Run all tests for Exasol 7.1.17	16s
Run all tests for Exasol 7.1.16	22s
Run all tests for Exasol 7.1.1	16s
Run all tests for Exasol 8.21.0	21s
Run all tests for Exasol 7.1.24	23s
Run all tests for Exasol 7.1.20	13s
Run all tests for Exasol 8.26.0	22s
Run all tests for Exasol 8.24.0	16s
Run all tests for Exasol 7.1.4	14s
Run all tests for Exasol 7.1.15	21s
Run all tests for Exasol 7.1.5	13s
Run all tests for Exasol 7.1.10	15s
Run all tests for Exasol 7.1.13	14s
Run all tests for Exasol 8.20.0	20s
Run all tests for Exasol 7.1.6	20s
Run all tests for Exasol 8.27.0	17s
Run all tests for Exasol 8.22.0	22s
Run all tests for Exasol 7.1.8	17s
Run all tests for Exasol 7.1.19	20s
Run all tests for Exasol 7.1.14	28s
Run all tests for Exasol 7.1.3	18s
Run all tests for Exasol 8.29.1	14s
Run all tests for Exasol 7.1.12	20s
Run all tests for Exasol 8.23.0	18s
Run all tests for Exasol 7.1.23	17s
Run all tests for Exasol 7.1.21	22s
Run all tests for Exasol default	28s
Run all tests for Exasol prerelease-8.17.0	17s
Run all tests for Exasol 7.1.0-d1	14s
	13m 4s

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