chore(dev-deps): bump @salesforce/cli-plugins-testkit #1123

Job	Run time
yarn-lockfile-check / lockfile-check	11s
linux-unit-tests / determine-node-versions	3s
linux-unit-tests / prevent-typescript-dependency / prevent-typescript-dependency	18s
linux-unit-tests / linux-unit-tests (current)	1m 3s
linux-unit-tests / linux-unit-tests (lts/*)	1m 3s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 2s
windows-unit-tests / determine-node-versions	3s
nuts (windows-latest) / yarn test:nuts	5m 26s
nuts (ubuntu-latest) / yarn test:nuts	32s
windows-unit-tests / windows-unit-tests (current)	2m 15s
windows-unit-tests / windows-unit-tests (lts/*)	2m 21s
windows-unit-tests / windows-unit-tests (lts/-1)	2m 31s
	16m 48s

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