Bump setup-java to v4

.github/workflows/cron.yml

@@ -2,6 +2,9 @@ name: Run Template Tests Against Pulumi CLI
 on:
   schedule:
     - cron: '0 8 * * *'
+  pull_request:
+    branches:
+      - master
   workflow_dispatch: {}
 
 env:
@@ -44,10 +47,14 @@ jobs:
       id-token: write
     steps:
       - name: Install Java 11 (temurin)
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
           java-version: '11'
+      - if: contains(matrix.platform, 'macOS')
+        name: Install sbt (Scala)
+        run: |
+          brew install sbt
       - name: Install DotNet ${{ matrix.dotnet }}
         uses: actions/setup-dotnet@v3
         with: