Update version in test

Author: rzeldent

platformio.ini

@@ -57,7 +57,7 @@ build_flags =
     '-D ESP_LCD_PANEL_IO_ADDITIONS_VER_PATCH=1'
 
 lib_deps =
-    lvgl/lvgl@^8.3.9
+    lvgl/lvgl@^8.4.0
     # The platformio.test_dir contains the test_main.cpp just to have an setup() and loop() function
     # so it will compile
     ${platformio.test_dir}