Merge pull request #21 from personnummer/renovate/actions-checkout-6.x

Update actions/checkout action to v6

Author: frozzare

.github/workflows/ruby.yml

@@ -18,7 +18,7 @@ jobs:
         ruby-version: [3.1, 3.2, 3.3, 3.4]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Ruby ${{ matrix.ruby-version }}
       uses: ruby/setup-ruby@v1
       with: