build: require meson 1.2

Update the requirement in meson.build and the CI runners to meson 1.2

This keeps things in line with glib and avoids unexpected suprises from
using meson versions that are way too old.

.gitlab-ci/test-msvc.bat

@@ -5,7 +5,7 @@ call "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliar
 @echo on
 
 :: FIXME: make warnings fatal
-pip3 install --upgrade --user meson~=0.64 || goto :error
+pip3 install --upgrade --user meson~=1.2 || goto :error
 meson setup -Dbackend_max_links=1 -Ddebug=false -Dmedia-gstreamer=disabled -Dvulkan=disabled _build || goto :error
 ninja -C _build || goto :error
 

meson.build

@@ -7,7 +7,7 @@ project('gtk', 'c',
           # https://github.com/mesonbuild/meson/issues/2289
           'c_std=gnu99',
         ],
-        meson_version : '>= 0.63.0',
+        meson_version : '>= 1.2.0',
         license: 'LGPL-2.1-or-later')
 
 # keep these numbers in sync with wrap files where there exist