Update yarn lock for proper checksum

[Zsailer]

Noticed that the tests have been failing for awhile.

I did a few things here to clean them up and get everything green (once someone adds a label 😄).

• It looks like a checksum difference in the yarn.lock. Updated here.
• Fix broken link
• Run black again to catch updates that were conflicting in pre-commit.

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[github-actions]

👈 Launch a Binder on branch Zsailer/jupyterlab-git/yarn-lock

[krassowski]

LGTM, thank you! Let's fix the integration tests in a follow-up PR.

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[Zsailer]

Thank you, @krassowski!