v9: Set log level to `warning` by default #5650

Job	Run time
macos \| stable	23s
cancel-previous-workflow	2s
macos \| beta	35s
ubuntu \| stable	30s
ubuntu \| beta	22s
windows \| stable	57s
windows \| beta	1m 1s
analyze / cancel-previous-workflow	3s
analyze / analyze	44s
analyze / package-analysis	1s
	4m 38s

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