Pin Undertow version to 2.3.20.Final due to bug affecting file upload… #4728

Job	Run time
build	3m 59s
unit_tests	3m 58s
integration_tests - Dataset	5m 11s
integration_tests - Solution	4m 49s
integration_tests - Organization	4m 51s
integration_tests - Run	4m 21s
integration_tests - Runner	5m 16s
integration_tests - Workspace	5m 1s
controller_tests - Organization	4m 52s
controller_tests - Workspace	4m 32s
controller_tests - Dataset	4m 23s
controller_tests - Solution	4m 49s
controller_tests - Runner	4m 44s
controller_tests - Meta	4m 42s
controller_tests - Run	4m 27s
controller_tests - Home	4m 16s
scan_and_push_container_images_to_registries	4m 24s
	1h 18m 35s

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