Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows #266

Job	Run time
build-and-test-python (dl-on-flink-framework)	53s
build-and-test (dl-on-flink-framework)	5m 7s
build-and-test-python (dl-on-flink-tensorflow)	10m 28s
build-and-test (dl-on-flink-operator)	6m 34s
build-and-test-python (dl-on-flink-tensorflow-2.x)	10m 34s
build-and-test (dl-on-flink-tensorflow-common)	2m 19s
build-and-test-python (dl-on-flink-pytorch)	6m 53s
build-and-test (dl-on-flink-tensorflow)	17m 32s
build-and-test (dl-on-flink-tensorflow-2.x)	18m 10s
build-and-test (dl-on-flink-pytorch)	8m 57s
build-and-test (dl-on-flink-lib)	1m 53s
build-and-test (dl-on-flink-examples)	2m 54s
build-and-test (dl-on-flink-examples/dl-on-flink-examples-pytorch)	3m 14s
build-and-test (dl-on-flink-examples/dl-on-flink-examples-tensorflow)	1m 28s
build-and-test (dl-on-flink-examples/dl-on-flink-examples-tensorflow-2.x)	1m 29s
	1h 38m 25s

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