fix for release script still using old JDK 8

Author: arcuri82

.github/workflows/release.yml

@@ -9,7 +9,7 @@ on:
 
 env:
   evomaster-version: 5.0.0
-  jdk-jar: 1.8
+  jdk-jar: 17
   jdk-jpackage: 21
   retention-days: 1
 ## Doesn't work, ie, use env in env