Merge branch 'bugfix/legacy_msys2_environment_update_v4.0' into 'release/v4.0'

doc: Update the MSYS2 legacy toolchain zip to same as master branch (v4.0)

See merge request espressif/esp-idf!7627

docs/en/get-started-legacy/windows-setup.rst

@@ -16,7 +16,7 @@ Toolchain Setup
 
 The quick setup is to download the Windows all-in-one toolchain & MSYS2 zip file from dl.espressif.com:
 
-https://dl.espressif.com/dl/esp32_win32_msys2_environment_and_gcc8_toolchain-20191220.zip
+https://dl.espressif.com/dl/esp32_win32_msys2_environment_and_gcc8_toolchain-20191231.zip
 
 Unzip the zip file to ``C:\`` (or some other location, but this guide assumes ``C:\``) and it will create an ``msys32`` directory with a pre-prepared environment.