Use git dependency for swiftpm #588

Job	Run time
Compile sqlite3 for windows-latest	9s
Compile sqlite3 for ubuntu-latest	5s
Compile sqlite3 for macos-latest	8s
Analyze on Dart stable	28s
Analyze on Dart stable	17s
Unit tests with Dart stable on ubuntu-latest	2m 24s
Unit tests with Dart dev on ubuntu-latest	2m 31s
Unit tests with Dart stable on windows-latest	1m 19s
Unit tests with Dart dev on windows-latest	1m 36s
Unit tests with Dart stable on macos-latest	46s
Unit tests with Dart dev on macos-latest	44s
integration_test_linux	1m 59s
integration_test_ios	18m 34s
integration_test_macos	0s
	31m 0s

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