Update dependency ember-intl to v6.5.4 #1285

Job	Run time
lint	2m 5s
test against additional browser in BrowserStack	2m 22s
test bundlesize	1m 36s
Test php backend (7.2)	22s
Test php backend (7.3)	19s
test against Chrome	2m 24s
test CSP in .htaccess	59s
test against Firefox	2m 25s
Test php backend (7.4)	14s
Test php backend (8.0)	40s
Test php backend (8.1)	18s
Test php backend (8.2)	25s
Test php backend (8.3)	22s
	14m 31s

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