feat(ci): remove ruby 2.4, add ruby 3.3 and 3.4 to the ci matrix

Author: ProGM

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.4, 2.7, '3.0', 3.1, 3.2, truffleruby-head]
+        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, 3.4, truffleruby-head]
 
     steps:
     - uses: actions/checkout@v3
@@ -22,13 +22,7 @@ jobs:
       run: |
         sudo apt-get install libsqlite3-dev
 
-    - name: Install legacy bundler for Ruby 2.4
-      if: ${{ matrix.ruby == 2.4 }}
-      run: |
-        gem install -q bundler -v 2.3.26 
-
-    - name: Install bundler 2.4+ for modern Rubies
-      if: ${{ matrix.ruby != 2.4 }}
+    - name: Install bundler
       run: |
         gem install -q bundler