Dependabot: Remove deprecated `reviewers` config #6919

Job	Run time
Packaging: Action input (ubuntu-latest, linked)	1m 8s
Packaging: Action input (ubuntu-latest, nightly-latest)	55s
Packaging: Action input (macos-latest, nightly-latest)	1m 31s
Packaging: Action input (windows-latest, nightly-latest)	5m 54s
Packaging: Action input (ubuntu-latest, default)	1m 3s
Packaging: Action input (macos-latest, default)	1m 23s
Packaging: Action input (macos-latest, linked)	2m 2s
Packaging: Action input (windows-latest, linked)	5m 55s
Packaging: Action input (windows-latest, default)	5m 49s
	25m 40s

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