Update dependency ruby to v4

Author: renovate[bot]

.github/workflows/build-mlkit.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: '4.0.1'
           bundler-cache: true
 
       - name: Set up Xcode

.github/workflows/check-mlkit-updates.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: '4.0.1'
           bundler-cache: true
 
       - name: Check for MLKit updates