misc: recast type to remove ts expected error comment

[ansmonjol]

Just saw this @ts-expected-error we could get rid of.

FYI this is what LagoGQLError looks like

export interface LagoGQLError extends GraphQLFormattedError {
  extensions: {
    code: LagoApiError
    details: Record<string, string[]>
  }
}

and the value is of type GraphQLFormattedError