fix(@angular-devkit/build-angular): prevent OS command injection in s… #3853

Job	Run time
list	35s
workflow (devkit-core-tests-rerun)	1m 28s
workflow (modules-builder-tests)	1m 55s
workflow (build-unit-tests)	2m 40s
workflow (build-cli)	1m 56s
workflow (devkit-core-tests)	1m 26s
	10m 0s

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