chore(deps): update dependency ruby to v4

Author: renovate[bot]

.github/workflows/fief.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.7
+          ruby-version: 4.0.1
           bundler-cache: true
       - run: gem install fief
       - run: |

.github/workflows/pdd.yml

@@ -20,7 +20,7 @@ jobs:
       - run: sudo apt-get update --yes --fix-missing && sudo apt-get install --yes ruby-dev libmagic-dev zlib1g-dev
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.7
+          ruby-version: 4.0.1
           bundler-cache: true
       - run: gem install pdd
       - run: pdd --format xml . | grep -v 'puzzle '

.github/workflows/releases.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4.7
+          ruby-version: 4.0.1
           bundler-cache: true
       - run: |
           sudo apt-get update --yes --fix-missing