add svn to test container

Author: pfefferle

.github/workflows/wp-phpunit.yml

@@ -23,8 +23,12 @@ jobs:
           - wp-version: '6.5'
             php-versions: '7.1'
     steps:
+      - name: Install svn
+        run: |
+          sudo apt-get update
+          sudo apt-get install subversion
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with: