Merge pull request #1292 from square/ray/update-validate-doc-site

update ruby version for markdown lint

Author: rjrjr

.github/workflows/validate-documentation.yml

@@ -16,9 +16,9 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Set up Ruby 2.6
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@v1.229.0
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4.2
       - name: Install dependencies
         run: gem install mdl
       - name: Lint docs