chore: avoid type error in certain environments

Author: stainless-app[bot]

src/internal/uploads.ts

@@ -138,7 +138,7 @@ export const createForm = async <T = Record<string, unknown>>(
 
 // We check for Blob not File because Bun.File doesn't inherit from File,
 // but they both inherit from Blob and have a `name` property at runtime.
-const isNamedBlob = (value: object): value is Blob => value instanceof Blob && 'name' in value;
+const isNamedBlob = (value: unknown): value is Blob => value instanceof Blob && 'name' in value;
 
 const isUploadable = (value: unknown) =>
   typeof value === 'object' &&