[update] Require dune >= 2.9

.gitlab-ci.yml

@@ -12,12 +12,3 @@ before_script:
   - duneci-install-module https://gitlab.dune-project.org/core/dune-common.git
   - duneci-install-module https://gitlab.dune-project.org/core/dune-geometry.git
   - duneci-install-module https://gitlab.dune-project.org/core/dune-grid.git
-
-dune:2.8 ubuntu:20.04 clang-10-20:
-  image: registry.dune-project.org/docker/ci/ubuntu:20.04
-  script: duneci-standard-test
-  variables:
-    DUNECI_TOOLCHAIN: clang-10-20
-    DUNECI_CMAKE_FLAGS: "-DDUNE_PYTHON_VIRTUALENV_SETUP=TRUE -DDUNE_ENABLE_PYTHONBINDINGS=TRUE -DBUILD_SHARED_LIBS=TRUE -DCMAKE_DISABLE_FIND_PACKAGE_Alberta=TRUE"
-    DUNECI_BRANCH: releases/2.8
-  tags: [duneci]