Fix compatibility with ember-cli 5.4+ #622

Job	Run time
Lint JS	25s
Tests: Type Check	16s
Tests (addon-location)	24s
Tests (test-app-location)	23s
ember-cli@latest : defaults with npm	1m 41s
Tests (addon-only)	49s
ember-cli@latest : defaults with yarn	2m 26s
Tests (monorepo with npm)	36s
ember-cli@latest : defaults with pnpm	45s
Tests (monorepo with yarn)	22s
ember-cli@latest : typescript with npm	2m 46s
Tests (monorepo with pnpm)	25s
ember-cli@latest : typescript with yarn	2m 16s
Tests (rollup-build)	59s
ember-cli@latest : typescript with pnpm	55s
[email protected] : defaults with npm	3m 5s
[email protected] : defaults with yarn	1m 41s
[email protected] : defaults with pnpm	2m 3s
[email protected] : typescript with npm	2m 56s
[email protected] : typescript with yarn	1m 57s
[email protected] : typescript with pnpm	1m 54s
	29m 4s

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