Bump versions: Golang, dependencies, Alpine

[bgandon]

Hi there, In this PR, I've bumped quite all versions I've found in the project. You'll not that the go.sum file is way larger as before. This comes from bumping the required dependencies with go get invocations, and then running go mod tidy. I've tried to re-run these commands from scratch in case it would produce a smaller set of dependencies, and this has reached the exact same result with go.mod and go.sum. So, these files are optimal it seems. Tests are running fine, don't hesitate to provide feedback so that we can move on with this. Best, Benjamin