Error Tip "Variable is not defined" is duplicated

[lltemplar]

it seems the highlightNode is not correct
https://github.com/graphql/graphiql/blob/main/packages/graphql-language-service-interface/src/getDiagnostics.ts#L142

[acao]

thank you @lltemplar ! is it possible for you to open a PR fix?

[dimaMachina]

fixed in graphiql 5