chore(deps): update dependency @ember/string to v4 #2541

Job	Run time
Lint addon	36s
Tests	46s
Tests - Floating Dependencies	59s
Typecheck [email protected]	49s
Typecheck [email protected]	41s
Typecheck [email protected]	50s
Typecheck [email protected]	42s
Tests - ember-lts-3.28	1m 3s
Tests - ember-release	57s
Tests - ember-beta	1m 1s
Tests - ember-canary	1m 4s
Tests - embroider-safe	58s
Tests - embroider-optimized	1m 1s
	11m 27s

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