Add Ruby 3.3 and 3.4 to CI matrix

Author: tejasbubane

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: CI 
+name: CI
 
 on: [push, pull_request]
 
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2', truffleruby-head]
+        ruby-version: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3', '3.4', truffleruby-head]
 
     steps:
     - uses: actions/checkout@v2
@@ -16,6 +16,6 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # 'bundle install' and cache
-    - name: Run specs 
+    - name: Run specs
       run: |
         bundle exec rake