SECURITY-11480: update actions

Co-authored-by: Laszlo Hammerl <laszlo.hammerl@emarsys.com>

Author: knagy

.github/workflows/ruby.yml

@@ -10,7 +10,7 @@ jobs:
         ruby-versions: ['3.2', '3.3', '3.4']
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-versions }}