Merge pull request #25178 from nextcloud/backport/25176/stable20

[stable20] Add "composer.lock" for acceptance tests to git

.gitignore

@@ -156,7 +156,6 @@ Vagrantfile
 clover.xml
 
 # Tests - dependencies
-tests/acceptance/composer.lock
 tests/acceptance/vendor/
 
 composer.phar

tests/acceptance/composer.json

@@ -1,10 +1,10 @@
 {
   "require-dev": {
-    "behat/behat": "^3.0",
+    "behat/behat": "3.7.0",
     "behat/mink": "1.7.1",
-    "behat/mink-extension": "*",
+    "behat/mink-extension": "2.3.1",
     "behat/mink-selenium2-driver": "1.3.1",
-    "phpunit/phpunit": "~4.6"
+    "phpunit/phpunit": "4.8.36"
   },
   "autoload": {
     "psr-4": {