Use new AppVeyor image to work around removed work-arounds

appveyor.yml

@@ -1,3 +1,6 @@
+image:
+  - Visual Studio 2022
+
 version: 1.7.3-{build}
 
 skip_tags: false
@@ -20,20 +23,8 @@ 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 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"
-  - if defined MINGW bash -lc "pacman --noconfirm -Sy"
-  - if defined MINGW bash -lc "pacman --noconfirm -Su"
-  - if defined MINGW bash -lc "pacman --noconfirm -Sy"
+  - if defined MINGW bash -lc "pacman --noconfirm -Syyu"
+  - if defined MINGW bash -lc "pacman --noconfirm -Syyu"
   - if defined MINGW bash -lc "pacman --noconfirm -S mingw-w64-x86_64-toolchain"
   - curl -SL https://win.rustup.rs/ -oC:\rustup-init.exe
   - C:\rustup-init.exe -y --default-host="%TARGET%" --default-toolchain="%TOOLCHAIN%"