chore(dev-deps): bump @salesforce/cli-plugins-testkit #1269

Job	Run time
yarn-lockfile-check / lockfile-check	12s
linux-unit-tests / determine-node-versions	1s
linux-unit-tests / prevent-typescript-dependency / prevent-typescript-dependency	17s
linux-unit-tests / linux-unit-tests (current)	1m 10s
linux-unit-tests / linux-unit-tests (lts/*)	1m 10s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 9s
windows-unit-tests / determine-node-versions	4s
nuts (windows-latest) / yarn test:nuts	6m 32s
nuts (ubuntu-latest) / yarn test:nuts	1m 37s
windows-unit-tests / windows-unit-tests (current)	4m 8s
windows-unit-tests / windows-unit-tests (lts/*)	4m 47s
windows-unit-tests / windows-unit-tests (lts/-1)	4m 6s
	25m 13s

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