Exclude Dependabot updates workflow from required PR checks #1218

Job	Run time
Diagnostic export (ubuntu-latest, stable-20230317)	1m 16s
Diagnostic export (macos-latest, stable-20230317)	3m 28s
Diagnostic export (windows-latest, stable-20230317)	2m 53s
Diagnostic export (ubuntu-latest, latest)	1m 14s
Diagnostic export (macos-latest, latest)	2m 52s
Diagnostic export (windows-latest, latest)	2m 46s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 14s
Diagnostic export (macos-latest, nightly-latest)	6m 32s
Diagnostic export (windows-latest, nightly-latest)	3m 4s
	25m 19s

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