Fix link for Package Requirements

Update a broken link.

Preview of this fix: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/micah.nagel-master-patch-70023/charter/NewPackageRequests.md

Previous w/ broken link: https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/master/charter/NewPackageRequests.md