[graphiql] graphiql/plugin-explorer dependency graphiql-explorer has outdated peerDependencies

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Current Behavior

graphiql/plugin-explorer dependency graphiql-explorer has outdated peerDependencies:

```
"peerDependencies": {
"graphql": "^0.6.0 || ^0.7.0 || ^0.8.0-b || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0",
"react": "^15.6.0 || ^16.0.0",
"react-dom": "^15.6.0 || ^16.0.0"
}
```

Functionally it seems to work with react+react-dom 19.2.8 an graphql 17.0.2, however the npm warnings are obnoxious. :)

### Expected Behavior

_No response_

### Steps To Reproduce

With:

```
"dependencies": {
"@graphiql/plugin-explorer": "5.1.5",
"graphiql": "5.4.0",
"graphql": "17.0.2",
"react": "19.2.8",
"react-dom": "19.2.8"
}
```

`npm install`

### Environment

* `react` Version: 19.2.8
* `graphql` Version: 17.0.2

### Anything else?

_No response_

Locate the graphiql-explorer package metadata used by @graphiql/plugin-explorer and compare its peerDependencies with the React, react-dom, and GraphQL versions in the report. Verify the dependency metadata against the provided npm install reproduction, and consider the work done when installation no longer emits the reported peer-dependency warnings.

Written by the indexing model from the issue text.