fix: @babel/traverse is a dependency not a dev-dependency

[runspired]

I think this is what is needed to resolve #23. Not able to test this via pnpm patch as apparently package.json dependencies can't be fixed that way. Setting pnpm up like the following which mirrors this change did work:

 "packageExtensions": {
      "babel-plugin-ember-template-compilation": {
        "dependencies": {
          "@babel/traverse": "^7.14.5"
        }
      }

[NullVoxPopuli]

Thank you!

[ef4]

Thanks. This got missed because it was originally only used for type imports, but then we added one real implementation import.

[ef4]

Followed up with #25 because we never should have depended directly on traverse in the first place.