Deprecated dependency warning: node-domexception@1.0.0 in @graphql-tools/github-loader

### Is your feature request related to a problem? Please describe.

## Describe the bug

When running `yarn install`, a deprecation warning appears for `node-domexception@1.0.0` which is a transitive dependency of `@graphql-codegen/cli`.

## Warning message

### Describe the solution you'd like

## Environment

- **@graphql-codegen/cli version**: 6.1.0
- **Node.js version**: 20.9.0
- **Package manager**: Yarn 1.x

## Expected behavior

No deprecation warnings from transitive dependencies.

## Suggested fix

The `node-domexception` package is deprecated because modern Node.js (v18+) has native `DOMException` support. The dependency chain could be updated:
- Update `@graphql-tools/github-loader` to use a newer fetch implementation
- Or update the transitive dependencies to versions that don't rely on `node-domexception`

## Additional context

This is a low-priority cosmetic issue but causes noise in CI/CD logs.

### Describe alternatives you've considered

_No response_

### Any additional important details?

_No response_