[vscode-graphql-syntax] literal string variables don't highlight properly

originally posted in https://github.com/shuding/nextra/issues/1949

### Is there an existing issue for this?

- [X] I have searched the existing issues

I noticed a bug with syntax highlighting of GraphQL queries where strings that immediately follow a [ are not properly colored.

If you look at

https://docs.bundlr.network/developer-docs/graphql#owners

You'll notice this GraphQL.

The first string, the one following the [ is grey, while the second string is green as it should be. If I delete the [ before the first string, it ends up highlighted green as it should be. Also if I add a space after the [, the string is green as it should be.

My guess is that there's a bug in the file `graphql.tmLanguage.json`, but I'm not sure.

Has anyone else seen this?

```graphql
query getByOwner {
transactions(owners: ["0xBcb812C6e26F4F0F78Bd7B6222461FF24F2942AE", "0xaC568a981B1370B2e1bAA8cE30BD5AC9E28C572D"]) {
edges {
node {
id
address
}
}
}
}
```