run ci tests also with Java 20 (by default)

Author: slachiewicz

.github/workflows/maven.yml

@@ -27,15 +27,14 @@ jobs:
     uses: codehaus-plexus/.github/.github/workflows/maven.yml@master
     with:
       jdk-fast-fail-build: '11'
-      jdk-matrix: '["11", "17", "18", "19-ea"]'
+#      jdk-matrix: '["11", "17", "20", "21-ea"]'
       jdk-distribution-matrix: '["zulu", "temurin", "microsoft", "liberica","corretto"]'
       os-matrix: '["ubuntu-latest","windows-latest", "macOS-latest"]'
-      matrix-exclude: '[
-          { "jdk": "18",    "distribution": "microsoft" },
-          { "jdk": "19-ea", "distribution": "corretto"  },
-          { "jdk": "19-ea", "distribution": "liberica"  },
-          { "jdk": "19-ea", "distribution": "microsoft" },
-          { "jdk": "19-ea", "distribution": "temurin"   }
-         ]'
+#      matrix-exclude: '[
+#          { "jdk": "21-ea", "distribution": "corretto"  },
+#          { "jdk": "21-ea", "distribution": "liberica"  },
+#          { "jdk": "21-ea", "distribution": "microsoft" },
+#          { "jdk": "21-ea", "distribution": "temurin"   }
+#         ]'
       maven_args: 'install javadoc:javadoc -e -B -V -fae -Pno-tests-if-not-on-osx'