Following the change to GitHub’s pricing, and in preparation for the launch of JUCE 6, the JUCE repository has been moved into its own GitHub organisation:
GitHub provides a redirect service, so all existing links to its previous location will continue to operate as expected.
However, it is good practice to update your existing local clones to point to the new repository URL:
$ git remote set-url origin firstname.lastname@example.org:juce-framework/JUCE.git
if you’re using SSH, or
$ git remote set-url origin https://github.com/juce-framework/JUCE.git
if you’re using HTTPS.
You can also go for the nuclear option of deleting your local clone and re-cloning from the new location if you don’t want to touch the command line.