docs-util: fixes following packages reorg (#9326)

- Typescript config aren't picked up properly anymore since they're moved to `_tsconfig.base.json` in the root. So, we now read the config from the config file.
- Update Typescript version in the `utils` monorepo to match that of the root monorepo

www/utils/packages/docs-generator/src/classes/kinds/oas.ts

@@ -1356,7 +1356,9 @@ class OasKindGenerator extends FunctionKindGenerator {
             name: title,
           }),
         }
-      case "intrinsicName" in itemType && itemType.intrinsicName === "boolean":
+      case ("intrinsicName" in itemType &&
+        itemType.intrinsicName === "boolean") ||
+        itemType.flags === ts.TypeFlags.BooleanLiteral:
         return {
           type: "boolean",
           title: title || typeAsString,