Update Java versions used in CI

Author: dhadka

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ 'ubuntu-latest', 'windows-latest' ]
-        java: [ '16', '17', '18', '19', '20' ]
+        java: [ '17', '18', '19', '20', '21' ]
     steps:
       - uses: actions/checkout@v3
       - name: Set up JDK ${{ matrix.java }}

.github/workflows/stage.yml

@@ -36,10 +36,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 16
+      - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
-          java-version: 16
+          java-version: 17
           distribution: temurin
       - name: Install required software
         run: |