[gitlab] simplify gql schema download

scripts/download-gql-schema.ts

@@ -29,7 +29,11 @@ const schemas: [
   [string | URL, GotOptions & { isStream?: true | undefined }],
 ][] = [
   ['github', 'graphql', ['https://docs.github.com/public/schema.docs.graphql', {}]],
-  ['gitlab', 'json', ['https://gitlab.com/api/graphql', introspection]],
+  [
+    'gitlab',
+    'graphql',
+    ['https://docs.gitlab.com/ee/api/graphql/reference/gitlab_schema.graphql', {}],
+  ],
 ];
 
 Promise.all(

src/vendor/gitlab/codegen.yml

@@ -1,5 +1,5 @@
 overwrite: true
-schema: src/vendor/gitlab/schema.json
+schema: src/vendor/gitlab/schema.graphql
 config:
   typesPrefix: GL
 generates: