Add risk assessment to PR template #5304

Job	Run time
Ruby analysis (macos-latest, default)	2m 3s
Ruby analysis (ubuntu-latest, linked)	1m 11s
Ruby analysis (macos-latest, linked)	1m 23s
Ruby analysis (ubuntu-latest, nightly-latest)	1m 8s
Ruby analysis (ubuntu-latest, default)	1m 8s
Ruby analysis (macos-latest, nightly-latest)	2m 12s
	9m 5s

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