go: update code to more modern version

[batazor]

Description

• Replaced the deprecated method with the new recommended method
• Updated the error handling

Issue reference

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Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

Thanks a bunch for this contribution and modernizing the golang code .. in all the quickstarts!

[paulyuk]

Let's wait for the tests to pass.

[batazor]

@paulyuk all good)

[paulyuk]

@paulyuk all good)

Thank you @batazor - I was away for a bit. This looks great. Merged!