Add Go 1.21

[ryan6416]

I would like to request support for the latest version of Golang, version 1.21.

Name: Golang
Website: https://go.dev
Language Version: 1.21
Test Frameworks: go test (built-in, ex: go test .), testify, gocheck, gopwt, gomega and many others.
How to install: Please refer to the official installation documentation.
How to compile/run:

• To compile a Go file, use the command go build file.go.
• To run a Go file, use the command go run file.go.

Golang 1.21 was recently released and includes many new features and improvements over previous versions. It would be great if Codewars could support this latest version of the language.

• 1.21 release notes

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👍 reaction might help to get this request prioritized.

[DonaldKellett]

Go 1.22 was released on 2024-02-06 so perhaps we should update the title

Since Go adheres to its compatibility guarantee at the source level, I assume upgrading Go on Codewars directly should not break most Kata? Unfortunately I was not able to find the Go runner image used by Codewars