fix(storage): Update offset on resumable upload retry (#12086)

fix(storage): Update offset on resumable upload retry (#12086) · googleapis/google-cloud-go@6ce8fe5

When resumable uploads retry, they may observe a flush offset which is past the start of the current send (in fact the whole send might have already completed). In that case, we avoided re-sending unnecessary data, but we didn't update the offset to account for the data not sent.

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