ci: enable java21 build; change jdk distribution to zulu (#5)

Author: mostroverkhov

.github/workflows/ci-build.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-20.04, macos-11, windows-2019 ]
-        jdk: [ 8, 11, 17 ]
+        jdk: [ 8, 11, 17, 21 ]
       fail-fast: false
 
     steps:
@@ -25,7 +25,7 @@ jobs:
         uses: actions/setup-java@v3
         with:
           java-version: ${{ matrix.jdk }}
-          distribution: 'temurin'
+          distribution: 'zulu'
       - name: Cache Gradle packages
         uses: actions/cache@v3
         with: