update bundler cache

Signed-off-by: Martin Schurz <Martin.Schurz@t-systems.com>

Author: schurzi

.github/workflows/test.yml

@@ -23,5 +23,6 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+        cache-version: 1
     - name: Run tests
       run: bundle exec rake