Give up on libyaml, run on macos-latest.

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
   tests:
     name: Ruby ${{ matrix.ruby }}
     if: "contains(github.event.commits[0].message, '[ci skip]') == false"
-    runs-on: ubuntu-latest
+    runs-on: macos-latest
     env:
       CI: true
       ALLOW_FAILURES: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'jruby' }}
@@ -21,10 +21,6 @@ jobs:
       matrix:
         ruby: ['3.0', 3.1, 3.2, ruby-head, jruby]
     steps:
-      - name: Install dependencies
-        run: |
-          wget http://mirrors.kernel.org/ubuntu/pool/main/liby/libyaml/libyaml-dev_0.2.5-1_amd64.deb
-          sudo apt-get install --yes ./libyaml-dev_0.2.5-1_amd64.deb
       - name: Clone repository
         uses: actions/checkout@v3
       - name: Set up Ruby