Fix the repository URL in `pubspec.yaml` #41

Job	Run time
health / changelog / run changelog health check	32s
health / breaking / run breaking health check	39s
health / coverage / run coverage health check	39s
health / do-not-submit / run do-not-submit health check	29s
health / leaking / run leaking health check	45s
health / license / run license health check	29s
health / comment	4s
	3m 37s

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