[graphiql] Linter error for VARIABLE_DEFINITION directive with default value

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

### Expected Behavior

I'd expect this query to not have linter errors.

### Steps To Reproduce

Create a `VARIABLE_DEFINITION` directive and put it on a variable definition that has a default value.

### Environment

* GraphiQL Version: 3.0.5

### Anything else?

_No response_