Switch builds environment matrix to Java 17 and 21.

Author: uhafner

.github/workflows/ci.yml

@@ -14,11 +14,6 @@ jobs:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
         jdk: [17, 21]
-        include:
-          - platform: ubuntu-latest
-            jdk: 11
-          - platform: macos-latest
-            jdk: 11
 
     runs-on: ${{ matrix.platform }}
     name: on ${{ matrix.platform }} with JDK ${{ matrix.jdk }}
@@ -28,7 +23,7 @@ jobs:
       - name: Set up JDK ${{ matrix.jdk }}
         uses: actions/setup-java@v3
         with:
-          distribution: 'zulu'
+          distribution: 'temurin'
           java-version: '${{ matrix.jdk }}'
           check-latest: true
           cache: 'maven'