Require node 18+ #873

Job	Run time
Tests: Type Check	14s
Lint JS	16s
Slow tests: defaults with npm	1m 55s
Tests (addon-location)	47s
Slow tests: typescript with npm	2m 7s
Tests (test-app-location)	46s
Slow tests: defaults with yarn	1m 19s
Slow tests: typescript with yarn	2m 3s
Tests (addon-only)	25s
Slow tests: defaults with pnpm	1m 15s
Slow tests: typescript with pnpm	1m 26s
Tests (monorepo with npm)	1m 28s
Tests (monorepo with yarn)	1m 24s
Tests (monorepo with pnpm)	46s
Tests (rollup-build)	53s
Tests (declarations-configuration)	31s
	17m 35s

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