doc: Add APDS9960 sensor driver in release note v1.9

Signed-off-by: Punit Vara <[email protected]>

Author: punitvara

doc/release-notes-1.9.rst

@@ -49,6 +49,7 @@ Drivers and Sensors
 *******************
 
 * KW40Z IEEE 802.15.4 radio driver support added
+* APDS9960 sensor driver added
 
 Networking
 **********