chore(deps): bump actions/cache from 5 to 6 (#77)

Author: dependabot[bot]

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v6
-    - uses: actions/cache@v5
+    - uses: actions/cache@v6
       with:
         path: vendor/bundle
         key: ${{ runner.os }}-gem-${{ hashFiles('**/Gemfile') }}