Add "Retired" type to "PhysicsLabFirmware"

Author: per1234

registry.txt

@@ -61,7 +61,7 @@ https://github.com/arduino-libraries/Arduino_MKRENV.git|Arduino|Arduino_MKRENV
 https://github.com/arduino-libraries/ArduinoGraphics.git|Arduino|ArduinoGraphics
 https://github.com/arduino-libraries/Arduino_MKRRGB.git|Arduino|Arduino_MKRRGB
 https://github.com/arduino-libraries/Arduino_MKRTHERM.git|Arduino|Arduino_MKRTHERM
-https://github.com/arduino-libraries/PhysicsLabFirmware.git|Arduino|PhysicsLabFirmware
+https://github.com/arduino-libraries/PhysicsLabFirmware.git|Arduino,Retired|PhysicsLabFirmware
 https://github.com/arduino-libraries/CTC-Go-Core-Module.git|Arduino|CTC GO CORE
 https://github.com/arduino-libraries/Arduino_MKRGPS.git|Arduino|Arduino_MKRGPS
 https://github.com/arduino-libraries/Arduino_OAuth.git|Arduino|Arduino_OAuth