build: Bump Meson dependency to 1.2.0

And update all the CI builds to use the latest micro release from that
series, 1.2.3.

This version bump means we can:
 - Drop some backwards-compatibility Meson checks
 - Fix a periodic CI failure caused by a now-fixed Meson bug
   (https://github.com/mesonbuild/meson/pull/10633)

It’s in line with our [Meson version policy](./docs/meson-version.md),
as Meson 1.2.1 is available in
[Debian Trixie](https://packages.debian.org/source/trixie/meson) and the
[freedesktop SDK](c95902f2ed/elements/components/meson.bst).

Signed-off-by: Philip Withnall <philip@tecnocode.co.uk>

.gitlab-ci/debian-stable.Dockerfile

@@ -68,7 +68,7 @@ RUN locale-gen de_DE.UTF-8 \
 
 ENV LANG=C.UTF-8 LANGUAGE=C.UTF-8 LC_ALL=C.UTF-8
 
-RUN pip3 install --break-system-packages meson==0.60.3
+RUN pip3 install --break-system-packages meson==1.2.3
 
 ARG HOST_USER_ID=5555
 ENV HOST_USER_ID ${HOST_USER_ID}

.gitlab-ci/fedora.Dockerfile

@@ -75,7 +75,7 @@ RUN dnf -y update \
     make \
  && dnf clean all
 
-RUN pip3 install meson==0.60.3
+RUN pip3 install meson==1.2.3
 
 COPY install-gitlab-cobertura-tools.sh .
 RUN ./install-gitlab-cobertura-tools.sh

.gitlab-ci/mingw.Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.gitlab.gnome.org/gnome/glib/fedora:v21
+FROM registry.gitlab.gnome.org/gnome/glib/fedora:v22
 
 USER root
 

.gitlab-ci/test-msvc.bat

@@ -12,7 +12,7 @@ for %%x in (%*) do (
 set args=%args:~1%
 
 :: FIXME: make warnings fatal
-pip3 install --upgrade --user meson==1.0.0  || goto :error
+pip3 install --upgrade --user meson==1.2.3  || goto :error
 meson setup %args% _build || goto :error
 python .gitlab-ci/check-missing-install-tag.py _build || goto :error
 meson compile -C _build || goto :error

.gitlab-ci/test-msys2.sh

@@ -26,7 +26,7 @@ CCACHE_BASEDIR="$(pwd)"
 CCACHE_DIR="${CCACHE_BASEDIR}/_ccache"
 export CCACHE_BASEDIR CCACHE_DIR
 
-pip3 install --upgrade --user meson==1.0.0
+pip3 install --upgrade --user meson==1.2.3
 
 PATH="$(cygpath "$USERPROFILE")/.local/bin:$HOME/.local/bin:$PATH"
 DIR="$(pwd)"