Update index.html

index.html

@@ -66,8 +66,8 @@
     </div>
 
     <script>
-        let apiKey = null;
-        let apiBaseUrl = null;
+        var apiKey = null;
+        var apiBaseUrl = null;
         async function transcribeAudio() {
             const audioFile = document.getElementById('audioFile').files[0];
             const transcriptionDiv = document.getElementById('transcription');