Update Go version in click-to-deploy

We should update the golang version in the [Dockerfile.template](https://github.com/GoogleCloudPlatform/click-to-deploy/blob/5c7523aefa0318aadaf3f4b1f809564d335fed85/docker/amppackager/templates/debian10/Dockerfile.template#L18) to match the one we're testing in [PR checks](https://github.com/ampproject/amppackager/blob/main/.github/workflows/prerequisites.yml), and then do another c2d release.