Update to use latest version of Cirq #822
Description
Cirq 1.4.x has been out for a while, and we should update to it. If 1.5.0 comes out before we release TFQ 0.7.4, we should support that.
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Cirq 1.4.x has been out for a while, and we should update to it. If 1.5.0 comes out before we release TFQ 0.7.4, we should support that.