Change v3 deprecation message to warning. #10907

Job	Run time
analyze-other (actions)	53s
check-codeql-versions	32s
analyze-other (python)	57s
analyze-javascript (ubuntu-22.04, linked)	4m 6s
analyze-javascript (windows-2022, linked)	5m 41s
analyze-javascript (ubuntu-24.04)	4m 28s
analyze-javascript (macos-15)	10m 18s
analyze-javascript (ubuntu-22.04)	4m 6s
analyze-javascript (windows-2025)	5m 48s
analyze-javascript (macos-14, linked)	7m 37s
analyze-javascript (ubuntu-24.04, linked)	4m 18s
analyze-javascript (windows-2022)	5m 39s
analyze-javascript (windows-2025, linked)	6m 13s
analyze-javascript (macos-14)	9m 38s
analyze-javascript (macos-15, linked)	9m 50s
	1h 20m 4s

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