Update Github workflow to use newer JDK

Author: A248

.github/workflows/main.yml

@@ -28,12 +28,13 @@ jobs:
     strategy:
       matrix:
         pg: [10, 11, 12, 13]
-        jdk: [8, 11]
+        jdk: [11, 16]
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-java@v1
+      - uses: actions/setup-java@v2
         with:
           java-version: ${{ matrix.jdk }}
+          distribution: 'zulu'
       - name: Setup PostgreSQL SSL Permissions
         run: |
           chmod 0400 ./driver/src/test/resources/certdir/server/server.key