[Picolibc] Moved github picolibc to 'picolibc' organization

[Keith Packard]

I've created a 'picolibc' organization on github and moved the
'picolibc' project there. I *think* existing URLs will continue to work,
but if you've got a git repository pointing at
https://github.com/keith-packard/picolibc, you might consider changing
the URL.

Let me know if I broke anything!

-- 
-keith
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