Update Ruby version

.github/workflows/build.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6.10
+        ruby-version: 3.3.5
     - name: Build and test with Rake
       run: |
         gem install bundler

.github/workflows/publish.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.6.10
+        ruby-version: 3.3.5
     - name: Setup Rubygems
       env:
         RUBYGEMS_API_KEY: ${{ secrets.RUBYGEMS_API_KEY }}

.ruby-version

@@ -0,0 +1 @@
+3.3.5