chore: use std request clone

[gastonqiu]

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[gopherbot]

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Patch Set 1:

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[gopherbot]

This PR (HEAD: 8cc323c) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/oauth2/+/507396 to see it.

Tip: You can toggle comments from me using the comments slash command (e.g. /comments off)
See the Wiki page for more info

[jwijenbergh]

This was submitted in #642 already

[gopherbot]

Message from Matt Hickford:

Patch Set 2: Code-Review+1 Run-TryBot+1

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[gopherbot]

Message from Gopher Robot:

Patch Set 2:

(1 comment)

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[gopherbot]

Message from Gopher Robot:

Patch Set 2: TryBot-Result+1

(1 comment)

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