oauth2/google: fix remove content-type header from idms get requests

[BigTailWolf]

This is a fix on the googleapis/google-cloud-go#9508.
The aws provider in that library is a ported dependency from here.

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[BigTailWolf]

This is a fix from the source side of the dependency on googleapis/google-cloud-go#9508

[gopherbot]

Message from Cody Oss:

Patch Set 1: Code-Review+2 Commit-Queue+1

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[gopherbot]

Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-03-12T01:36:53Z","revision":"a68d9bc794eec1f764fa939a654dd75070cd2847"}

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Message from Cody Oss:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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[gopherbot]

Message from Cody Oss:

Patch Set 1:

(1 comment)

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[gopherbot]

This PR is being closed because golang.org/cl/570875 has been merged.