Add change log for connected machine (#24496)

Author: vidai-msft

src/ConnectedMachine/ConnectedMachine/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Introduced secrets detection feature to safeguard sensitive data.
 
 ## Version 0.7.0
 * Added `ScriptLocalPath` to `New-AzConnectedMachineRunCommand` to let users add script files locally