Update ruby/setup-ruby action to v1.280.0

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@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        uses: ruby/setup-ruby@d5f787ce339eb0767271bc01d922e85644c2c8ab # v1.280.0
         with:
           bundler-cache: true
       - name: Run Jekyll