Update actions to fix testing, add more platforms

.github/workflows/specs.yml

@@ -7,19 +7,24 @@ on:
     branches: [ main ]
 
 jobs:
-  build:
-
-    runs-on: ubuntu-latest
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest, macos-latest ]
+        # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
+        ruby: [ '2.7', '3.0', '3.1', '3.2', '3.3', head, jruby, jruby-head, truffleruby, truffleruby-head ]
+    runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Install additional dependencies
       run: |
         sudo apt update && sudo apt install postgresql-client -y
-    - name: Set up Ruby 2.7
-      uses: actions/setup-ruby@v1
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7.x
+        ruby-version: ${{ matrix.ruby }}
 
     - name: Setup PostgreSQL
       uses: Harmon758/postgresql-action@v1