Fix: Added ALIGN(8) for __etext section. This existed in mbed-6.3.0 version. I have not verified if it is truly needed, but it is better to err on the safe side.

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G431xB/TOOLCHAIN_GCC_ARM/stm32g431xb.ld

@@ -111,6 +111,11 @@ SECTIONS
     } > FLASH
     __exidx_end = .;
 
+    /* Location counter can end up 2byte aligned with narrow Thumb code but
+       __etext is assumed by startup code to be the LMA of a section in RAM
+       which must be 8-byte aligned */
+    . = ALIGN(8);
+
     __etext = .;
     _sidata = .;