Use correct component when determining default version value

Author: sormuras

src/Download.java

@@ -98,7 +98,7 @@ static void main(boolean dryRun, String... args) {
 
       // Set outputs
       outputs.put("archive", archive.toString());
-      var digit = Character.isDigit(jdk.version().charAt(0));
+      var digit = Character.isDigit(jdk.release.charAt(0));
       outputs.put("version", website.computeVersionString(uri, digit ? "PARSE_URI" : "HASH_URI"));
     } catch (Exception exception) {
       exception.printStackTrace(System.err);