v9: Set log level to `warning` by default (#2836) #5664

Job	Run time
macos \| stable	20s
cancel-previous-workflow	3s
macos \| beta	20s
ubuntu \| stable	29s
ubuntu \| beta	19s
windows \| stable	38s
windows \| beta	32s
analyze / analyze	40s
analyze / cancel-previous-workflow	2s
analyze / package-analysis	1m 33s
	4m 56s

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