[go.mod] Change go directive to 1.21

[mx-psi]

Relates to #1438

Signed-off-by: Pablo Baeyens pablo.baeyens@datadoghq.com

[mx-psi]

@lmb would you mind approving the workflows?

[lmb]

@mx-psi sorry, I got sidetracked!

[lmb]

Seems like things work! Not sure what broke originally. Mind adding some context to the commit message?

[mx-psi]

I amended the commit to include a more descriptive commit message :)

[lmb]

So, I've figured out why I didn't do it this way from the start: it breaks toolchain forward compat. Trying to run a command inside the module with go < 1.21 doesn't work since 1.21 is not a valid toolchain.

I'm not exactly sure what the consequences of that are, but overall it makes me think that the original change was the right one.

[mx-psi]

Trying to run a command inside the module with go < 1.21 doesn't work since 1.21 is not a valid toolchain.

Can you give me an example of the command you are trying to run? If it causes trouble, I surely don't want to do this on my project either!

[lmb]

This is for a different repo, but the same rules apply:

$ go1.21.0 build
$ go mod edit -go=1.22
$ grep -F 1.22 go.mod
go 1.22
$ go1.21.0 build
go: downloading go1.22 (linux/amd64)
go: download go1.22 for linux/amd64: toolchain not available
$ go mod edit -go=1.22.0
$ go1.21.0 build
go: downloading go1.22.0 (linux/amd64)
$ 

I guess toolchain go1.22.0 would also fix this, but that seems more cumbersome for little (no?) gain.

[mx-psi]

@lmb Looks like this is getting fixed upstream: golang/go@27ed85d. The fix is also being backported to Go 1.21 (golang/go/issues/67235) and Go 1.22 (golang/go/issues/67236).

[lmb]

Thanks for digging this out!