chore: use fmt.Errorf instead of errors.Wrap

[flaneur2020]

it seems that errors.Wrap was introduced before fmt.Errorf() in the stdlib was introduced.

the current error message is like:

context canceled: DoRequestFailed

the convention is becoming to put the root cause part into the right side, for example:

do request failed: context canceled

[forsaken628]

github.com/pkg/errors provides stack information that will make debugging easier, otherwise we need to carefully handle the error message