fix(deps): bump @salesforce/core from 8.3.0 to 8.4.0 #1385

Job	Run time
yarn-lockfile-check / lockfile-check	7s
linux-unit-tests / determine-node-versions	2s
linux-unit-tests / prevent-typescript-dependency / prevent-typescript-dependency	17s
linux-unit-tests / linux-unit-tests (current)	1m 45s
linux-unit-tests / linux-unit-tests (lts/*)	1m 48s
linux-unit-tests / linux-unit-tests (lts/-1)	2m 1s
windows-unit-tests / determine-node-versions	2s
nuts (ubuntu-latest, yarn test:nuts) / yarn test:nuts	16m 53s
nuts (ubuntu-latest, yarn test:nuts:legacy) / yarn test:nuts:legacy	7m 15s
nuts (windows-latest, yarn test:nuts:legacy) / yarn test:nuts:legacy	7m 4s
nuts (windows-latest, yarn test:nuts) / yarn test:nuts	20m 8s
windows-unit-tests / windows-unit-tests (current)	3m 38s
windows-unit-tests / windows-unit-tests (lts/*)	3m 21s
windows-unit-tests / windows-unit-tests (lts/-1)	3m 42s
	1h 8m 3s

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