Revert "add change log for 4.0.5"

This reverts commit ab8221b2.

ChangeLog.md

-# RT-Thread v4.0.5 released
-
-Change log since v4.0.4
-
-## Kernel
-
-* Remove weak symbol from `rt_memset` , `rt_memcmp`, and add it for `rt_vsnprintf`
-
-## Components
-
-* Update Libc
-  * Fix the error when invoking `fopen` with mode "b"
-* [AT] Fix the overflow problem of input array
-* lwIP
-  * Fix the problem of implicit declaration of "lwip_ip4_route_src"
-  * Solve the conflict between multi BYTE_ORDERs
-
-## BSP
-
-* [qemu-vexpress-gemini] fix build errors
-* STM32
-  * Add SOC_SERIES_STM32G0 to use "stm32_wdt.hiwdg.Init.Window = 0x00000FFF"; otherwise, the watchdog will always reset.
-  * [STM32L4] Fix the failure of the first erase after programming
-* [GD32F4xx] Fix the problem of startup file
-* Revert STM32 stack size to 0x400, which is set by mistake in [#5129](https://github.com/RT-Thread/rt-thread/pull/5129)
-
 # RT-Thread v4.0.4 released
 
 Change log since v4.0.3