Add ArduinoGraphics as a library dependency

[seaxwi]

The ArduinoGraphics library are used by these examples:

• examples/Modulino_Thermo/TemperatureHumidityMatrix/TemperatureHumidityMatrix.ino
• examples/Utilities/FirmwareUpdater/FirmwareUpdater.ino

Compilation will fail for these examples unless the user has manually installed the ArduinoGraphics library.

Example of compilation error:

/private/var/folders/58/gntldnl9249ck9fjblgv9jdw0000gp/T/.arduinoIDE-unsaved2024104-2234-z4s2yo.tblw/FirmwareUpdater/FirmwareUpdater.ino:1:10: fatal error: ArduinoGraphics.h: No such file or directory
 #include "ArduinoGraphics.h"
          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1

Compilation error: ArduinoGraphics.h: No such file or directory

This problem can be avoided by declaring ArduinoGraphics as a library dependency in library.properties.