An analyst upgrade lifted shares of the coffee chain.Shares of Dutch Bros (BROS 8.20%) were moving higher again, continuing a surge from earlier in the week after the drive-thru coffee chain delivered impressive results in its first-quarter earnings report.Today, the coffee slinger seemed to benefit from a Wall Street upgrade, reflecting the strong results in its recent earnings report.As of 1:17 p.m. ET, the stock was up 8%. Dutch Bros gets a nod from Wall StreetTD Cowen upgraded its rating on Dutch Bros f ...