chore(deps): update dart docker tag to v3.7 #94

Job	Run time
correctness	15s
test-macos	25s
test-os (ubuntu-latest, stable)	20s
test-versions (2.18)	29s
test-os (ubuntu-latest, beta)	25s
test-windows	1m 17s
test-versions (2.19)	28s
test-os (ubuntu-latest, dev)	19s
test-versions (3.0)	29s
test-os (macos-latest, stable)	29s
test-versions (beta)	22s
test-os (macos-latest, beta)	27s
test-os (macos-latest, dev)	32s
test-os (windows-latest, stable)	48s
test-os (windows-latest, beta)	47s
test-os (windows-latest, dev)	41s
	8m 33s

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