Bump Go version to 1.22 in dev containers config

[sebhtml]

Context

In the README, it is written that:

Prebid Server requires Go version 1.21 or newer.

However, in the Dev Containers configuration, Go 1.20 is configured:

  	"VARIANT": "1.20",

Consequence

A natural consequence of that is the following compile error is obtained when one opens the project with Dev Containers with Visual Studio Code (tested with VS Code 1.93.1):

could not import maps (no required module provides package "maps") compiler BrokenImport

Root Cause Analysis

The package "maps" does not exist in Go 1.20. See https://pkg.go.dev/maps?tab=versions
If there is a table with nothing on it and you ask someone to eat the apple that is on the table, there will be consequences.
(Feedback from the environment)

Solution

A no-brainer solution is to make the Dev Containers configuration congruent with the README file.

[SyntaxNode]

Nice catch. @bsardo missed this when upgrading to Go 1.22. While we support 1.21, the dockerfile is building with 1.22.3. Do you think we should update the dev container to the same version?

[bsardo]

Nice catch. @bsardo missed this when upgrading to Go 1.22. While we support 1.21, the dockerfile is building with 1.22.3. Do you think we should update the dev container to the same version?

Oops. Yes let's update this to 1.22.

[sebhtml]

Nice catch. @bsardo missed this when upgrading to Go 1.22. While we support 1.21, the dockerfile is building with 1.22.3. Do you think we should update the dev container to the same version?

Oops. Yes let's update this to 1.22.

Hello @bsardo

Should I update to 1.22 in Dev Containers and in the README ?

Thank you.

[bsardo]

Hello @bsardo
Should I update to 1.22 in Dev Containers and in the README ?

Hi @sebhtml, yes please. That would be great.

[sebhtml]

Hello @bsardo
Should I update to 1.22 in Dev Containers and in the README ?

Hi @sebhtml, yes please. That would be great.

Hello @bsardo,

It's done. See commit 5aae4cd .

Thank you.