Qt 6.6 compilation errors

[prodrive11]

Few compilation errors compiling under linux/ubuntu g++ (Ubuntu 11.2.0-7ubuntu2) 11.2.0
related to casting, and Qt 6.6 API breaking changes

connections/lawicel_serial.cpp: In member function ‘void LAWICELSerial::serialError(QSerialPort::SerialPortError)’:                                                                                         
connections/lawicel_serial.cpp:392:23: error: ‘ParityError’ is not a member of ‘QSerialPort’                                                                                                                
  392 |     case QSerialPort::ParityError:                                                            
      |                       ^~~~~~~~~~~                                                             
connections/lawicel_serial.cpp:395:23: error: ‘FramingError’ is not a member of ‘QSerialPort’                                                                                                               
  395 |     case QSerialPort::FramingError:                                                           
      |                       ^~~~~~~~~~~~                                                            
connections/lawicel_serial.cpp:398:23: error: ‘BreakConditionError’ is not a member of ‘QSerialPort’                                                                                                        
  398 |     case QSerialPort::BreakConditionError:                                                    
      |                       ^~~~~~~~~~~~~~~~~~~                                                     
make: *** [Makefile:25193: lawicel_serial.o] Error 1     

[prodrive11]

Have a PR for that.