[Bug] Altair introspect query error

### What happened?
Using Altair playground not working, 'cause query to wrong path

### What did you expect?
Altair can introspect schema

### Steps to reproduce
You can run repo from here [LINK](https://github.com/WildEgor/fibergo-gql-gateway)

Define route for Altair ("/altair") and for GQL ("/graphql"), but Altair make request to "/altair" instead and cannot get schema

### versions
- github.com/99designs/gqlgen v0.17.42
- go version go1.21.3 windows/amd64