Add JDK 20 to CI

Author: slachiewicz

.github/workflows/maven.yml

@@ -25,8 +25,8 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest,windows-latest, macOS-latest]
-        java: [8, 11, 17]
-        jdk: [adopt-hotspot, zulu, temurin]
+        java: [8, 11, 17, 20]
+        jdk: [temurin]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}