chore: 'flutter format' is now 'dart format'

Author: vHanda

Makefile

@@ -12,7 +12,7 @@ protos:
 	protoc --dart_out=grpc:lib/generated -Iprotos protos/builders.proto
 	protoc --dart_out=grpc:lib/generated -Iprotos protos/core.proto
 	rm lib/analytics/generated/analytics.pbgrpc.dart
-	flutter format lib/
+	dart format lib/
 
 	reuse addheader --license 'AGPL-3.0-or-later' --copyright 'Vishesh Handa <[email protected]>' --year '2021' lib/analytics/generated/*
 	reuse addheader --license 'AGPL-3.0-or-later' --copyright 'Vishesh Handa <[email protected]>' --year '2021' lib/markdown/generated/*