chore(deps): update dependency ruby to v3.4.8

Author: renovate[bot]

.github/workflows/release_gem.yml

@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@v5
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.4'
+        ruby-version: '3.4.8'
     - run: "bundle install"
     - name: Test
       run: bundle exec rake