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Upgrade to Dart 3 (SDK >=3.12.0) #40

Job	Run time
checks / analyze-additional-checks	3s
checks / dependency-validator	24s
checks / analyze	26s
test (3.12.2)	2m 21s
build / sbom	22s
checks / check-release-notes	8s
checks / format	0s
checks / additional-checks (no_entrypoint_imports)	14s
	3m 58s