retain only jdk 16 github test action

Author: IndeedSi

.github/workflows/maven-test.yml

@@ -18,15 +18,16 @@ jobs:
 
     strategy:
       matrix:
-        java: [ '8', '11', '16' ]
+        java: [ '16' ]
 
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK
+      uses: actions/setup-java@v2
       with:
+        distribution: 'zulu'
         java-version: ${{ matrix.java }}
 
     - name: compile and test