fix(@angular-devkit/core): update `ajv` to `8.18.0` #3106

Job	Run time
list	2m 38s
workflow (build-unit-tests)	4m 31s
workflow (devkit-core-tests)	1m 28s
workflow (devkit-core-tests-rerun)	4m 28s
workflow (build-cli)	1m 51s
workflow (modules-builder-tests)	2m 13s
	17m 9s

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