Migrate from babel 7 to babel 8

[gameroman]

Babel 8 was released recently, going ESM-only

https://dependents.dev/?package=%40babel%2Ftypes%407

https://dependents.dev/?package=%40babel%2Ftraverse%407

https://dependents.dev/?package=%40babel%2Fcore%407

[43081j]

sounds like a good thing for us to get involved in!

Dependabot will hopefully catch a lot of them, but we could at least monitor the situation and contribute any that don't.