chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/documentation.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Cache gems
-        uses: actions/cache@v2
+        uses: actions/cache@v5
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-flow-${{ hashFiles('**/Gemfile.lock') }}