Update for release

lib/SCSI2SD/CHANGELOG

@@ -1,4 +1,4 @@
-2021xxxx        6.4.x
+20210810        6.4.12
     - Fix USB disconnect issue when no SD card is installed.
 
 20210628        6.4.11

lib/SCSI2SD/src/firmware/config.c

@@ -36,7 +36,7 @@
 
 #include <string.h>
 
-static const uint16_t FIRMWARE_VERSION = 0x064B;
+static const uint16_t FIRMWARE_VERSION = 0x064C;
 
 // Optional static config
 extern uint8_t* __fixed_config;