Update actions/checkout action to v5 (#26)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/benchmark.yaml

@@ -61,7 +61,7 @@ jobs:
           echo "max=$(cat max_time.txt)" >> $GITHUB_OUTPUT
           rm time.txt mean_time.txt min_time.txt max_time.txt
       - name: Checkout GitHub pages
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
         if: ${{ always() && !cancelled() }}
         with:
           ref: gh-pages