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Upgrade to Dart 3 (SDK >=3.12.0) #35

Job	Run time
test (3.12.2)	2m 39s
build / sbom	21s
checks / analyze-additional-checks	4s
checks / check-release-notes	8s
checks / analyze	31s
checks / dependency-validator	24s
checks / format	0s
checks / additional-checks (no_entrypoint_imports)	52s
	4m 59s