Dan + Shay’s Dan Smyers and Shay Mooney have teamed with Justin Bieber to try to score their seventh No. 1 single with the release of “10,000 Hours.” Co-penned by Dan, Shay, Justin, Jessie Jo Dillon, Jordan Reynolds and Jason Boyd, “10,000 Hours” features Shay and Justin trading vocals alongside Dan’s production. The tune is…