chore(deps): update dependency concurrently to v9 #2574

Job	Run time
Lint addon	42s
Tests - Floating Dependencies	54s
Tests	49s
Typecheck [email protected]	45s
Typecheck [email protected]	1m 5s
Typecheck [email protected]	43s
Typecheck [email protected]	42s
Tests - ember-lts-3.28	58s
Tests - ember-release	57s
Tests - ember-beta	1m 8s
Tests - ember-canary	1m 33s
Tests - embroider-safe	1m 6s
Tests - embroider-optimized	57s
	12m 19s

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