Update Package-Test-Runner.yml

Author: ryma2fhir

.github/workflows/Package-Test-Runner.yml

@@ -34,6 +34,11 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
+      
+      - uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
 
       - name: Check out ${{github.event.inputs.githubrepo}}
         uses: actions/checkout@master