chore(deps-dev): bump ember-source from 5.3.0 to 5.4.0 #904

Job	Run time
Floating Dependencies	59s
Tests	1m 11s
Type checking - [email protected]	56s
ember-try: ember-lts-3.28	1m 14s
Type checking - [email protected]	1m 5s
ember-try: ember-lts-4.4	1m 58s
Type checking - typescript@next	56s
ember-try: ember-lts-4.8	1m 2s
ember-try: ember-lts-4.12	1m 51s
ember-try: ember-release	1m 1s
ember-try: ember-beta	57s
ember-try: ember-canary	57s
ember-try: ember-classic	1m 29s
ember-try: embroider-safe	1m 24s
ember-try: embroider-optimized	1m 9s
	18m 9s

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