chore(dev-deps): bump @salesforce/cli-plugins-testkit #1549

Job	Run time
yarn-lockfile-check / lockfile-check	12s
linux-unit-tests / determine-node-versions	3s
linux-unit-tests / linux-unit-tests (current)	1m 25s
linux-unit-tests / linux-unit-tests (lts/*)	1m 29s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 27s
windows-unit-tests / determine-node-versions	2s
nuts (windows-latest) / yarn test:nuts	14m 1s
nuts (ubuntu-latest) / yarn test:nuts	2m 22s
windows-unit-tests / windows-unit-tests (current)	2m 58s
windows-unit-tests / windows-unit-tests (lts/*)	4m 25s
windows-unit-tests / windows-unit-tests (lts/-1)	3m 43s
	32m 7s

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