Remove unnecessary DateTimeFormatter variable

Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/rss/RSSHandlerRoutine.java

@@ -271,8 +271,6 @@ private void postItem(List<TextChannel> textChannels, Item rssItem, RSSFeed feed
      */
     private void updateLastDateToDatabase(RSSFeed feedConfig, @Nullable RssFeedRecord rssFeedRecord,
             Instant lastPostedDate) {
-        DateTimeFormatter dateTimeFormatter =
-                DateTimeFormatter.ofPattern(feedConfig.dateFormatterPattern());
         String lastDateStr = lastPostedDate.toString();
 
         if (rssFeedRecord == null) {