fix(@angular-devkit/build-angular): update less to 4.9.0 #4279

Job	Run time
list	35s
workflow (devkit-core-tests-rerun)	1m 35s
workflow (build-cli)	1m 41s
workflow (build-unit-tests)	2m 25s
workflow (devkit-core-tests)	1m 27s
workflow (modules-builder-tests)	1m 51s
	9m 34s

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