Add old name for STM32H743ZI

Author: theotherjimmy

tools/arm_pack_manager/legacy-names.json

@@ -44,6 +44,7 @@
     "STM32F756ZG": "STM32F756ZGTx",
     "STM32F767ZI": "STM32F767ZITx",
     "STM32F769NI": "STM32F769NIHx",
+    "STM32H743ZI": "STM32H743ZITx",
     "STM32L011K4": "STM32L011K4Tx",
     "STM32L031K6": "STM32L031K6Tx",
     "STM32L053C8": "STM32L053C8Tx",