Update ruby/setup-ruby action to v1.276.0 (#64)

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

Author: renovate[bot]

.github/workflows/build-site.yml

@@ -20,7 +20,7 @@ jobs:
           fetch-depth: 1
           persist-credentials: false
       - name: Set up Ruby
-        uses: ruby/setup-ruby@d354de180d0c9e813cfddfcbdc079945d4be589b # v1.275.0
+        uses: ruby/setup-ruby@ae195bbe749a7cef685ac729197124a48305c1cb # v1.276.0
         with:
           bundler-cache: true
       - name: Run Jekyll