py3-*: bump pkgrel and update upstream versions

Update all non-sr.ht Python packages

py3-billiard: "upgrade" to 3.6.4.0

py3-billiard: bump pkgrel

py3-billiard: bump pkgrel

py3-billiard: upgrade to 3.6.3.0

sr.ht/py3-billiard: bump pkgrel

sr.ht/py3-billiard: upgrade to 3.6.1.0

Update all dependency packages

Set all pkgrels to zero

Move into subdir for abuild reasons