Replaced openjdk-ea (broken) with openjdk20 in the Travis CI settings

Author: ebourg

.travis.yml

@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - openjdk-ea
+  - openjdk20
   - openjdk17
   - openjdk11
   - openjdk8
@@ -15,7 +15,7 @@ before_install:
 matrix:
   fast_finish: true
   allow_failures:
-    - jdk: openjdk-ea
+    - jdk: openjdk20
 
 after_success:
   - mvn clean test jacoco:report-aggregate coveralls:report -DjacocoReports=jsign/target/site/jacoco-aggregate/jacoco.xml