treewide: use log/slog instead of golang.org/x/exp/slog

[rolinh]

Now that we are using Go v1.21, we can use the log/slog from the standard library instead of the experimental package.

This is a follow-up to #1108

[rolinh]

The static check failure is due to golangci-lint being built with Go 1.20 and not Go 1.21 meaning it does not understand the new built-ins (min and max notably) that are introduced with this new version and used in the standard library.
I have locally rebuilt golangci-lint with Go v1.21.0 and can confirm that it doesn't complain after that. So I think we have a couple of options:

• Wait for a golangci-lint release (I'd expect one to happen today or tomorrow)
• Revert the PR that updated Go to v1.21.0

[tklauser]

The static check failure is due to golangci-lint being built with Go 1.20 and not Go 1.21 meaning it does not understand the new built-ins (min and max notably) that are introduced with this new version and used in the standard library. I have locally rebuilt golangci-lint with Go v1.21.0 and can confirm that it doesn't complain after that. So I think we have a couple of options:

• Wait for a golangci-lint release (I'd expect one to happen today or tomorrow)

I'd prefer this option, given a golangci-lint release will happen later this week. We can still revert the Go 1.21.0 update if the golangci-lint release is delayed for some reason.

[rolinh]

Nice, v1.54.0 was just released: https://github.com/golangci/golangci-lint/releases/tag/v1.54.0. Let's trigger renovate to pick up the update.

EDIT: I didn't want to wait on the bot and just pushed a commit to update golangci-lint.

[tklauser]

Neat, thanks!