fix: bundle install in benchmarks

.github/workflows/ruby.yml

@@ -35,15 +35,14 @@ jobs:
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically
-    - name: Install dependencies
-      run: bundle install
     - name: Compile
       run: bundle exec rake compile
     - name: Run tests
       run: bundle exec rspec
     - name: Run benchmarks
       working-directory: benchmarks
       run: |
+        bundle install
         time THREADS=4 bundle exec ruby multi_thread_comporess.rb city.json
         time THREADS=4 bundle exec ruby multi_thread_decomporess.rb city.json
         time THREADS=4 bundle exec ruby multi_thread_streaming_comporess.rb city.json