Update Dependabot configuration for GitHub Actions #7863

Job	Run time
Packaging: Config file (ubuntu-latest, linked)	1m 28s
Packaging: Config file (windows-latest, linked)	3m 27s
Packaging: Config file (windows-latest, default)	4m 57s
Packaging: Config file (macos-latest, default)	1m 43s
Packaging: Config file (ubuntu-latest, default)	1m 35s
Packaging: Config file (macos-latest, linked)	1m 23s
Packaging: Config file (windows-latest, nightly-latest)	3m 32s
Packaging: Config file (macos-latest, nightly-latest)	1m 30s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 18s
	20m 53s

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