[pygobject] CI: install pycairo from pypi not git master

[Christoph Reiter <creiter src gnome org>]

commit 804511980a8883c014ca695965b482f29671ff13
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Fri Jan 24 09:26:32 2020 +0100

    CI: install pycairo from pypi not git master
    
    master has dropped Python 2 support

 .gitlab-ci/test-docker-old.sh | 3 +--
 .gitlab-ci/test-docker.sh     | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/.gitlab-ci/test-docker-old.sh b/.gitlab-ci/test-docker-old.sh
index de238f81..d03d983d 100755
--- a/.gitlab-ci/test-docker-old.sh
+++ b/.gitlab-ci/test-docker-old.sh
@@ -16,7 +16,6 @@ mkdir -p "${COV_DIR}"
 mkdir -p "${CCACHE_DIR}"
 
 # test
-python -m pip install git+https://github.com/pygobject/pycairo.git
-python -m pip install pytest pytest-faulthandler coverage
+python -m pip install pycairo pytest pytest-faulthandler coverage
 python setup.py build_tests
 xvfb-run -a python -m coverage run --context "${COV_KEY}" tests/runtests.py
diff --git a/.gitlab-ci/test-docker.sh b/.gitlab-ci/test-docker.sh
index 964a3674..dcf4636b 100755
--- a/.gitlab-ci/test-docker.sh
+++ b/.gitlab-ci/test-docker.sh
@@ -22,8 +22,7 @@ export PYTHONDEVMODE=1
 mkdir -p "${CCACHE_DIR}"
 mkdir -p "${COV_DIR}"
 
-python -m pip install git+https://github.com/pygobject/pycairo.git
-python -m pip install flake8 pytest pytest-faulthandler coverage
+python -m pip install pycairo flake8 pytest pytest-faulthandler coverage
 
 export CFLAGS="-coverage -ftest-coverage -fprofile-arcs -Werror"