Test with Ruby 3.3 on CI

Author: ankane

.github/workflows/build.yml

@@ -10,10 +10,10 @@ jobs:
     steps:
       - if: ${{ startsWith(matrix.os, 'windows') }}
         run: git config --global core.autocrlf false
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.2
+          ruby-version: 3.3
           bundler-cache: true
       - if: ${{ startsWith(matrix.os, 'macos') }}
         run: brew install libomp

Gemfile

@@ -8,3 +8,4 @@ gem "daru"
 gem "matrix" # for daru
 gem "numo-narray", platform: [:ruby, :x64_mingw]
 gem "rover-df", platform: [:ruby, :x64_mingw]
+gem "csv"