[pygobject] ci: don't use meson master for testing, use the latest release instead

[Christoph Reiter <creiter src gnome org>]

commit 9140750640b3e2f583a5a4f9b0507f7636d6eda1
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Nov 4 20:28:45 2018 +0100

    ci: don't use meson master for testing, use the latest release instead
    
    Initially we needed unreleased features but that's no longer the case.
    Building with meson master is currently broken for us because of
    https://github.com/mesonbuild/meson/issues/4470
    
    Switch to installing from pypi instead.

 .gitlab-ci/test-docker.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci/test-docker.sh b/.gitlab-ci/test-docker.sh
index 1a6dddb8..141d6542 100755
--- a/.gitlab-ci/test-docker.sh
+++ b/.gitlab-ci/test-docker.sh
@@ -27,7 +27,7 @@ python -m pip install flake8 pytest pytest-faulthandler coverage
 export CFLAGS="-coverage -ftest-coverage -fprofile-arcs -Werror"
 
 # MESON
-/usr/bin/python3 -m pip install --user git+https://github.com/mesonbuild/meson.git
+/usr/bin/python3 -m pip install --user meson
 export PATH="${HOME}/.local/bin:${PATH}"
 export PKG_CONFIG_PATH="$(python -c 'import sys; sys.stdout.write(sys.prefix)')/lib/pkgconfig"
 # pycairo install under PyPy doesn't install a .pc file