chore(dev-deps): bump @salesforce/cli-plugins-testkit #1160

Job	Run time
yarn-lockfile-check / lockfile-check	7s
linux-unit-tests / determine-node-versions	3s
linux-unit-tests / prevent-typescript-dependency / prevent-typescript-dependency	17s
linux-unit-tests / linux-unit-tests (current)	59s
linux-unit-tests / linux-unit-tests (lts/*)	1m 0s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 0s
windows-unit-tests / determine-node-versions	1s
nuts (windows-latest) / yarn test:nuts	7m 37s
nuts (ubuntu-latest) / yarn test:nuts	35s
windows-unit-tests / windows-unit-tests (current)	3m 15s
windows-unit-tests / windows-unit-tests (lts/*)	3m 58s
windows-unit-tests / windows-unit-tests (lts/-1)	2m 35s
	21m 27s

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