Fixes getSignedUrl Return Type

[reichjustin]

Fixes #497

Currently, the getSignedUrl type is returning GetSignedPolicyResponse. It should be GetSignedUrlResponse

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

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[reichjustin]

I Agreed

[googlebot]

CLAs look good, thanks!

[JustinBeckwith]

Thank you so much for the fix!