stm32-firmware: Bump uapp to v1.2

Author: tuxuser

firmware/userapp/Core/Src/main.c

@@ -70,7 +70,7 @@ __attribute__((used))
 const tombstone_t tombstone = {
     .magic = UAPP_MAGIC,
     .ver_major = 1,
-    .ver_minor = 1,
+    .ver_minor = 2,
     .size = 0x5A53, // ASCII: SZ
     .crc = 0x00435243, // ASCII: CRC + \0
     .reserved = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,0xFF, 0xFF, 0xFF, 0xFF,  0xFF, 0xFF, 0xFF, 0xFF },