chore(deps): update module go to 1.19

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.16 -> 1.19

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[bourgeoisor]

We should probably update the Dockerfile base images at the same time, e.g.: https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/main/hello-app/Dockerfile#L1 https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/main/workload-metrics/Dockerfile#L15

[bourgeoisor]

Closing in favour of https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/pull/369

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