Using TCK Tested JDK builds of OpenJDK (#2293)

The AdoptOpenJDK has been discontinued since July 2021 (https://adoptopenjdk.net). Switching the distribution to Azul Zulu. When using Zulu you get all the latest updated (TCK Tested) builds for all versions of OpenJDK.

.github/workflows/pull-request.yml

@@ -13,16 +13,18 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        java-version: [ 11 ]
     steps:
     - name: Download repository
       uses: actions/checkout@v2
 
-    - name: Setup Java
+    - name: Setup Java ${{ matrix.java-version }}
       uses: actions/setup-java@v2
       with:
-        distribution: 'adopt'
-        java-version: '11'
+        distribution: 'zulu'
+        java-version: ${{ matrix.java-version }}
 
     - name: Build with Gradle
       run: bash ./gradlew build --stacktrace