Test against JDK16 GA instead of EA

Author: yrodiere

.github/workflows/build.yml

@@ -129,7 +129,7 @@ jobs:
           - { name: "8", java-version: 8, release_type: "ga" }
           - { name: "11", java-version: 11, release_type: "ga" }
           - { name: "15", java-version: 15, release_type: "ga" }
-          - { name: "16-ea", java-version: 16, release_type: "ea" }
+          - { name: "16", java-version: 16, release_type: "ga" }
           - { name: "17-ea", java-version: 17, release_type: "ea" }
     steps:
     - uses: actions/checkout@v2