chore(deps-dev): bump @salesforce/cli-plugins-testkit #5963

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	23s
linux-unit-tests / linux-unit-tests (current)	1m 4s
linux-unit-tests / linux-unit-tests (lts/*)	1m 8s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 5s
windows-unit-tests / determine-node-versions	4s
nuts (ubuntu-latest) / yarn test:nuts	2m 46s
nuts (windows-latest) / yarn test:nuts	10m 43s
windows-unit-tests / windows-unit-tests (current)	3m 9s
windows-unit-tests / windows-unit-tests (lts/*)	5m 14s
windows-unit-tests / windows-unit-tests (lts/-1)	5m 21s
	31m 6s

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