Switch Java 20 CI to Bellsoft Liberica

Closes gh-34752

ci/scripts/detect-jdk-updates.sh

@@ -20,6 +20,10 @@ case "$JDK_VERSION" in
 		 BASE_URL="https://api.bell-sw.com/v1/liberica/releases?version-feature=17"
 		 ISSUE_TITLE="Upgrade Java 17 version in CI image"
 	;;
+	java20)
+		 BASE_URL="https://api.bell-sw.com/v1/liberica/releases?version-feature=20"
+		 ISSUE_TITLE="Upgrade Java 20 version in CI image"
+	;;
 	*)
 		echo $"Unknown java version"
 		exit 1;