Fixes CAMEL-22597 batter handling of jiraUrl when resolving userTimeZone (#19694)

Author: JiriOndrusek

components/camel-jira/src/main/java/org/apache/camel/component/jira/consumer/NewIssuesConsumer.java

@@ -87,7 +87,7 @@ private String getServerTimestamp() {
      * @return {@link DateTimeZone} of the user
      */
     private DateTimeZone getUserTimeZone() {
-        URI userURI = URI.create(getEndpoint().getConfiguration().getJiraUrl() + "/rest/api/latest/myself");
+        URI userURI = URI.create(getEndpoint().getConfiguration().getJiraUrl()).resolve("rest/api/latest/myself");
         final User user = getEndpoint().getClient().getUserClient().getUser(userURI).claim();
         final String timezone = user.getTimezone();