AppVeyor doesn't need explicit MSYS2 packages

appveyor.yml

@@ -20,14 +20,7 @@ environment:
 install:
   - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
   - if defined MINGW set PATH=C:\msys64\mingw64\bin;C:\msys64\usr\bin;%PATH%
-  # https://www.msys2.org/news/#2020-05-17-32-bit-msys2-no-longer-actively-supported
-  - if defined MINGW curl -SL http://repo.msys2.org/msys/x86_64/msys2-keyring-r21.b39fb11-1-any.pkg.tar.xz -oC:\msys2-keyring.txz
-  - if defined MINGW curl -SL http://repo.msys2.org/msys/x86_64/msys2-keyring-1~20210904-1-any.pkg.tar.zst -oC:\msys2-keyring.tzst
-  - if defined MINGW curl -SL http://repo.msys2.org/msys/x86_64/zstd-1.4.7-1-x86_64.pkg.tar.xz -oC:\zstd.txz
-  - if defined MINGW curl -SL http://repo.msys2.org/msys/x86_64/pacman-5.2.2-5-x86_64.pkg.tar.xz -oC:\pacman.txz
-  - if defined MINGW pacman --noconfirm -U C:\msys2-keyring.txz
-  - if defined MINGW pacman --noconfirm -U C:\zstd.txz
-  - if defined MINGW pacman --noconfirm -U C:\pacman.txz
+  - if defined MINGW curl -SL http://repo.msys2.org/msys/x86_64/msys2-keyring-1~20220623-1-any.pkg.tar.zst -oC:\msys2-keyring.tzst
   - if defined MINGW pacman --noconfirm -U C:\msys2-keyring.tzst
   - if defined MINGW bash -lc "pacman --needed --noconfirm -Sy pacman-mirrors"
   - if defined MINGW bash -lc "pacman --noconfirm -Sy pacman"