Update dependency ruby to v3.4.9

Author: renovate[bot]

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '3.4.9'
         bundler-cache: true
     - name: Run rubocop
       run: bundle exec rake rubocop

.github/workflows/update_certs.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: '3.4.9'
         bundler-cache: true
     - name: Check k0s Certs
       id: check-certs-expired