Add NUCLEO_H745ZI_Q

https://os.mbed.com/platforms/ST-Nucleo-H745ZI-Q/

Author: jeromecoutant

src/mbed_os_tools/detect/platform_database.py

@@ -181,6 +181,7 @@
         u"0839": u"NUCLEO_WB55RG",
         u"0840": u"B96B_F446VE",
         u"0841": u"NUCLEO_G474RE",
+        u"0843": u"NUCLEO_H745ZI_Q",
         u"0847": u"DISCO_H745I",
         u"0849": u"NUCLEO_G070RB",
         u"0850": u"NUCLEO_G431RB",