chore(deps-dev): bump @types/rsvp from 4.0.6 to 4.0.8 #748

Job	Run time
Floating Dependencies	1m 15s
Tests	58s
Type checking - [email protected]	57s
Type checking - [email protected]	51s
ember-lts-3.28	54s
Type checking - typescript@next	47s
ember-lts-4.4	48s
ember-lts-4.8	1m 11s
ember-lts-4.12	51s
ember-release	57s
ember-beta	55s
ember-canary	1m 7s
ember-classic	56s
embroider-safe	53s
embroider-optimized	53s
	14m 13s

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