The new version asttokens has been released

[sshishov]

Currently we have the following pin

The package `devtools` requires `asttokens>=2.0.0,<3.0.0`, but `3.0.0` is installed

Recently (2 weeks ago) the new version of asttokens 3.0.0 was release, can we try to support it and to unblock the upgrade for all other libraries who can rely on the newer version?

It can happen that we can just loosen the pin to be <4.0.0? But of course, require some validation...