try: bump java version to 20

.github/workflows/quarkus-native-mandrel-in-docker-jib.yaml

@@ -9,6 +9,7 @@ on: [ push, pull_request, workflow_dispatch ]
 env:
   JIB_BUILD_OPTS:
     -Dquarkus.native.container-build=true
+    -Dquarkus.native.builder-image=quay.io/quarkus/ubi-quarkus-mandrel-builder-image:jdk-20
     -Dquarkus.container-image.build=true
     -Dquarkus.container-image.push=true
     -Dquarkus.container-image.registry=ghcr.io
@@ -38,7 +39,7 @@ jobs:
         uses: graalvm/setup-graalvm@v1
         with:
           version: 'mandrel-latest'
-          java-version: '17'
+          java-version: '20'
           cache: 'maven'
 
       - name: Build Quarkus Native with Maven, Mandrel, Docker and Jib

pom.xml

@@ -8,7 +8,7 @@
     <version>1.2.0</version>
     <properties>
         <compiler-plugin.version>3.11.0</compiler-plugin.version>
-        <maven.compiler.release>17</maven.compiler.release>
+        <maven.compiler.release>20</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <quarkus.platform.artifact-id>quarkus-bom</quarkus.platform.artifact-id>