Bump test from 1.21.5 to 1.21.6 in /device_doctor (#2119)
Bump test from 1.21.5 to 1.21.6 in /device_doctor (#2119)


flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon,flutter/cocoon