Use lvgl:master:HEAD for CI build.

[aentinger]

This change is made in order to verify the correct working of all examples during various refactoring operations.
However, this change needs to be reverted in order to allow verification if lvgl has indeed released a working 8.1 library version.

[github-actions]

Memory usage change @ adc00b7

Board	flash	%	RAM for global variables	%
arduino:mbed_nano:nanorp2040connect	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Braccio__Template flash	%	examples/Braccio__Template RAM for global variables	%	examples/Braccio_factory_setID_interactive flash	%	examples/Braccio_factory_setID_interactive RAM for global variables	%	examples/LCD_Custom_Menu flash	%	examples/LCD_Custom_Menu RAM for global variables	%	examples/LCD_Menu_Joystick flash	%	examples/LCD_Menu_Joystick RAM for global variables	%	examples/LCD_Motors flash	%	examples/LCD_Motors RAM for global variables	%	examples/LearnByDoing flash	%	examples/LearnByDoing RAM for global variables	%	examples/New_APIs flash	%	examples/New_APIs RAM for global variables	%	examples/Tools/Check_Inputs flash	%	examples/Tools/Check_Inputs RAM for global variables	%	examples/Tools/Test_Motor_Angular_Control flash	%	examples/Tools/Test_Motor_Angular_Control RAM for global variables	%	examples/Tools/Test_Motor_Communication flash	%	examples/Tools/Test_Motor_Communication RAM for global variables	%
arduino:mbed_nano:nanorp2040connect	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0

Click for full report CSV

Board,examples/Braccio__Template<br>flash,%,examples/Braccio__Template<br>RAM for global variables,%,examples/Braccio_factory_setID_interactive<br>flash,%,examples/Braccio_factory_setID_interactive<br>RAM for global variables,%,examples/LCD_Custom_Menu<br>flash,%,examples/LCD_Custom_Menu<br>RAM for global variables,%,examples/LCD_Menu_Joystick<br>flash,%,examples/LCD_Menu_Joystick<br>RAM for global variables,%,examples/LCD_Motors<br>flash,%,examples/LCD_Motors<br>RAM for global variables,%,examples/LearnByDoing<br>flash,%,examples/LearnByDoing<br>RAM for global variables,%,examples/New_APIs<br>flash,%,examples/New_APIs<br>RAM for global variables,%,examples/Tools/Check_Inputs<br>flash,%,examples/Tools/Check_Inputs<br>RAM for global variables,%,examples/Tools/Test_Motor_Angular_Control<br>flash,%,examples/Tools/Test_Motor_Angular_Control<br>RAM for global variables,%,examples/Tools/Test_Motor_Communication<br>flash,%,examples/Tools/Test_Motor_Communication<br>RAM for global variables,%
arduino:mbed_nano:nanorp2040connect,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0