build: always use the latest go and golangci-lint for gitpod [skip ci]

[stasadev]

The Issue

It is easy to forget to update some packages in Dockerfile for Gitpod after release.

How This PR Solves The Issue

Try to use the latest version all the time.

Found the solution for go here.
And it was super easy for golangci-lint - I just removed the hard-coded version.

Manual Testing Instructions

$ docker buildx build -t ddev/ddev-gitpod-base --platform=linux/amd64 .gitpod/images

$ docker run --rm -it ddev/ddev-gitpod-base go version
go version go1.21.3 linux/amd64

$ docker run --rm -it ddev/ddev-gitpod-base golangci-lint version
golangci-lint has version 1.55.1 built with go1.21.3 from 9b20d49d on 2023-10-25T10:03:43Z

Automated Testing Overview

Related Issue Link(s)

Release/Deployment Notes

[rfay]

Looks as good as it gets! Thanks!

[rfay]

Followup will be to push a new version of the image, probably with a new tag, and update here and in ddev-gitpod-launcher. I think it would be OK to push now and add the new tag to this PR.

[stasadev]

Pushed a new tag and updated it here and in ddev-gitpod-launcher.

[rfay]

gitpod /workspace/ddev (master) $ go version && ddev --version
go version go1.21.3 linux/amd64
ddev version v1.22.4

Thanks so much!