Require Python 3.7.
Require Python 3.7.

PiperOrigin-RevId: 392503495
Change-Id: Ib4949f8eb383b08a325693a340bc82a6211a37b6
GitOrigin-RevId: 611fd66e16dc5cbccd3c1c8ff1797cb0b2ca156b

deepmind/xmanager,deepmind/xmanager