chore(client): qualify global Blob

Author: stainless-app[bot]

src/client.ts

@@ -742,7 +742,7 @@ export class Kernel {
         // Preserve legacy string encoding behavior for now
         headers.values.has('content-type')) ||
       // `Blob` is superset of `File`
-      body instanceof Blob ||
+      ((globalThis as any).Blob && body instanceof (globalThis as any).Blob) ||
       // `FormData` -> `multipart/form-data`
       body instanceof FormData ||
       // `URLSearchParams` -> `application/x-www-form-urlencoded`