Update the PIDX URL and timestamp

Author: yanjos-dev

AWS.pidx

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <index schemaVersion="1.0.0" xs:noNamespaceSchemaLocation="PackIndex.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance">
   <vendor>AWS</vendor>
-  <url>https://github.com/FreeRTOS/CMSIS/releases/download/Beta/</url>
-  <timestamp>2020-10-14T15:00:00.0000000+00:00</timestamp>
+  <url>https://github.com/FreeRTOS/CMSIS/raw/main/</url>
+  <timestamp>2020-10-15T12:23:00.0000000+00:00</timestamp>
   <pindex>
     <pdsc url="https://github.com/FreeRTOS/CMSIS/releases/download/Beta/" vendor="AWS" name="AWS_IoT_Device_Defender" version="1.1.0-Beta"/>
     <pdsc url="https://github.com/FreeRTOS/CMSIS/releases/download/Beta/" vendor="AWS" name="AWS_IoT_Device_Shadow" version="1.0.2-Beta"/>