Allow test libraries to be updated for varying PHP versions

.github/workflows/test-unit.yml

@@ -103,7 +103,7 @@ jobs:
       run: curl -sSL https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin/ --filename=composer
 
     - name: Install dependencies
-      run: composer install --prefer-dist --no-progress
+      run: composer update --prefer-dist --no-progress
       working-directory: ./e107_tests/
 
     - name: Download Git submodule dependencies

e107_tests/composer.json

@@ -8,10 +8,5 @@
     "codeception/module-asserts": "^1.1",
     "codeception/module-db": "^1.0",
     "codeception/module-phpbrowser": "^1.0"
-  },
-  "config": {
-    "platform": {
-      "php": "5.6"
-    }
   }
 }