chore(dev-deps): bump @salesforce/cli-plugins-testkit #847

Job	Run time
yarn-lockfile-check / lockfile-check	6s
linux-unit-tests / determine-node-versions	4s
nuts (ubuntu-latest) / yarn test:nuts	2m 33s
nuts (windows-latest) / yarn test:nuts	8m 15s
linux-unit-tests / prevent-typescript-dependency / prevent-typescript-dependency	15s
linux-unit-tests / linux-unit-tests (current)	56s
linux-unit-tests / linux-unit-tests (lts/*)	55s
linux-unit-tests / linux-unit-tests (lts/-1)	54s
windows-unit-tests / determine-node-versions	2s
windows-unit-tests / windows-unit-tests (current)	3m 29s
windows-unit-tests / windows-unit-tests (lts/*)	3m 49s
windows-unit-tests / windows-unit-tests (lts/-1)	4m 11s
	25m 29s

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