Update dependency ruby to v3

Author: renovate[bot]

.github/workflows/pr_checks.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4.7
           bundler-cache: true
       - run: 'command -v rpm || if command -v apt-get; then apt-get update; apt-get install -y rpm; fi ||:'
       - run: bundle exec rake check:syntax:yaml
@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4.7
           bundler-cache: true
       - run: 'command -v rpm || if command -v apt-get; then apt-get update; apt-get install -y rpm; fi ||:'
       - run: |
@@ -44,7 +44,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7
+          ruby-version: 3.4.7
           bundler-cache: true
       - run: 'command -v rpm || if command -v apt-get; then apt-get update; apt-get install -y rpm; fi ||:'
       - run: |