Build on JDK 8,11,12

.github/workflows/continuous-integration-workflow.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        jdk: [8,9,10,11,12,14]
+        jdk: [8,11,12]
       fail-fast: false
     steps:
       - uses: actions/checkout@v2

.github/workflows/pr-build-workflow.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        jdk: [8,9,10,11,12,14]
+        jdk: [8,11,12]
       fail-fast: false
     steps:
       - uses: actions/checkout@v2