ci: update github actions workflow

.github/workflows/main.yml

@@ -1,27 +1,21 @@
-name: Ruby
+name: Run tests
 
-on:
-  push:
-    branches:
-      - main
-
-  pull_request:
+on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
-    name: Ruby ${{ matrix.ruby }}
-    strategy:
-      matrix:
-        ruby:
-          - '3.0.5'
 
+    runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
-        bundler-cache: true
-    - name: Run the default task
-      run: bundle exec rake
+      - uses: actions/checkout@v3
+
+      - name: Set up Ruby 3.3.3
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3.3
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Run tests
+        run: bundle exec rake