tests

fix(deps): bump @salesforce/sf-plugins-core from 3.1.15 to 3.1.20 #737

Job	Run time
yarn-lockfile-check / lockfile-check	14s
linux-unit-tests / linux-unit-tests (lts/-1)	1m 44s
linux-unit-tests / linux-unit-tests (lts/*)	1m 34s
linux-unit-tests / linux-unit-tests (latest)	6m 14s
windows-unit-tests / windows-unit-tests (lts/-1)	6m 37s
windows-unit-tests / windows-unit-tests (lts/*)	3m 40s
windows-unit-tests / windows-unit-tests (latest)	10m 0s
nuts (windows-latest) / yarn test:nuts	14m 58s
nuts (ubuntu-latest) / yarn test:nuts	3m 25s
	48m 26s

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