Merge branch '5.1' into 5.x

* 5.1:
  Fix tests on github actions

Author: nicolas-grekas

.github/workflows/tests.yml

@@ -113,7 +113,7 @@ jobs:
             -   name: Configure composer
                 run: |
                     ([ -d ~/.composer ] || mkdir ~/.composer) && cp .github/composer-config.json ~/.composer/config.json
-                    SYMFONY_VERSION=$(cat composer.json | grep '^ *\"version\". *\"[1-9]' | grep -o '[0-9.]*[0-9]')
+                    SYMFONY_VERSION=$(cat composer.json | grep '^ *\"branch-version\". *\"[1-9]' | grep -o '[0-9.]*')
                     echo "::set-env name=SYMFONY_VERSION::$SYMFONY_VERSION"
                     echo "::set-env name=COMPOSER_ROOT_VERSION::$SYMFONY_VERSION.x-dev"