[ci] install a fixed version of meson in msys2 bots

for some reason apparently msys2 installation here has 0.51 version, which, is weird, lets use a fixed version anyway

appveyor.yml

@@ -32,8 +32,9 @@ environment:
       MSYSTEM: MINGW32
 
 build_script:
-  - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "pacman --noconfirm --force -S --needed mingw-w64-$MSYS2_ARCH-{gcc,freetype,cairo,icu,gettext,gobject-introspection,gcc,gcc-libs,glib2,graphite2,pkg-config,python3,python3-pip,ragel,meson,ninja}"'
+  - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "pacman --noconfirm --force -S --needed mingw-w64-$MSYS2_ARCH-{gcc,freetype,cairo,icu,gettext,gobject-introspection,gcc,gcc-libs,glib2,graphite2,pkg-config,python3,python3-pip,ragel,ninja}"'
   - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "pip install fonttools"'
+  - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "pip install --upgrade meson==0.53.0"'
   - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "curl https://raw.githubusercontent.com/mirror/mingw-w64/023eb04c396d4e8d8fcf604cfababc53dae13398/mingw-w64-headers/include/dwrite_1.h > %MINGW_PREFIX%/%MINGW_CHOST%/include/dwrite_1.h"'
   - 'if "%compiler%"=="msys2" C:\msys64\usr\bin\bash -lc "cd $APPVEYOR_BUILD_FOLDER; meson build --wrap-mode=nofallback -Dfreetype=enabled -Dglib=enabled -Dcairo=enabled -Dgobject=enabled -Dgdi=enabled -Ddirectwrite=enabled -Dgraphite=enabled && meson test -Cbuild --print-errorlogs"'