Update CI: Add Ruby 3.2 and update GA runners (#722)

* Add Ruby 3.2 to CI

* Use ubuntu-latest and macos-latest runners

* Fix condition

.github/workflows/ci.yml

@@ -10,8 +10,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-10.15]
-        ruby: [2.6, 2.7, '3.0', 3.1, jruby-head]
+        os: [ubuntu-latest, macos-latest]
+        ruby: [2.6, 2.7, '3.0', 3.1, 3.2, jruby-head]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
@@ -22,5 +22,5 @@ jobs:
       - run: bundle exec rubocop
       - run: bundle exec rspec
       - name: E2E tests
-        if: ${{ success() && matrix.os != 'macos-10.15' }}
+        if: ${{ success() && matrix.os != 'macos-latest' }}
         run: bash spec/e2e/e2e_run.sh