Skip PR checks for events triggered by Dependabot #5150

Job	Run time
Diagnostic export (macos-latest, linked)	1m 14s
Diagnostic export (macos-latest, nightly-latest)	1m 21s
Diagnostic export (windows-latest, nightly-latest)	7m 15s
Diagnostic export (windows-latest, linked)	2m 31s
Diagnostic export (ubuntu-latest, linked)	1m 5s
Diagnostic export (ubuntu-latest, nightly-latest)	59s
	14m 25s

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