Add risk assessment to PR template #5314

Job	Run time
Ruby analysis (macos-latest, linked)	1m 14s
Ruby analysis (macos-latest, default)	55s
Ruby analysis (ubuntu-latest, linked)	54s
Ruby analysis (macos-latest, nightly-latest)	1m 14s
Ruby analysis (ubuntu-latest, nightly-latest)	58s
Ruby analysis (ubuntu-latest, default)	54s
	6m 9s

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