Merge pull request #101 from OpenVoxProject/checkout

CI: Update actions/checkout v4->v6

Author: bastelfreak

.github/workflows/gem_release.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Build the gem
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with: