chore(deps): update flutter_markdown to ^0.7.0 #120

Job	Run time
flutter-test-analyze / Analyze	1m 1s
flutter-test-analyze / Format	35s
flutter-test-analyze / Test	1m 4s
flutter-build / iOS	4s
flutter-build / WEB	3s
flutter-build / Android (apk)	6m 13s
	9m 0s

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