gql.tada doctor/check cannot handle headers in schema object

[KammererTob]

Describe the bug

gql.tada CLI commands which parse the config containing headers in the schema object fail (examples are doctor and check).

Reproduction:

1. New Project with those two files.
   package.json:

{
  "name": "gql-tada-bug",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "gql.tada": "^1.5.1",
    "typescript": "^5.4.5"
  },
  "devDependencies": {
    "@0no-co/graphqlsp": "^1.10.1"
  }
}

tsconfig.json (copied from the documentation):

{
  "compilerOptions": {
    "plugins": [ 
      {
        "name": "@0no-co/graphqlsp",
        "schema": {
          "url": "http://localhost:4321/graphql",
          "headers": {
            "Accept": "application/graphql-response+json"
          }
        }
      }
    ]
  }
}

2. yarn / npm install
3. gql.tada doctor

Leads to the following error:

⚠ Error
The plugin configuration for "@0no-co/graphqlsp" seems to be invalid.
┗ Configuration contains a schema.headers property, but it's not an object

Reproduction

No response

gql.tada version

gql.tada v1.5.1

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