fixed #401 Migrate spring-boot from 2 to 3

Author: thomaswoehlke

src/main/resources/templates/user/messages/all.html

@@ -56,7 +56,7 @@ <h2>
           <span th:text="${m.messageText}"></span>
           <span style="float:right">
               <small>
-                  <span th:text="${#dates.format(m.rowCreatedAt,'dd.MM.yyyy HH:mm:ss')}"></span>
+                  <span th:text="${#temporals.format(m.rowCreatedAt,'dd.MM.yyyy HH:mm:ss')}"></span>
                   <i th:if="${m.readByReceiver}" class="fas fa-check"></i>
               </small>
           </span>
@@ -66,7 +66,7 @@ <h2>
           <span th:text="${m.messageText}"></span>
           <span style="float:right">
               <small>
-                  <span th:text="${#dates.format(m.rowCreatedAt,'dd.MM.yyyy HH:mm:ss')}"></span>
+                  <span th:text="${#temporals.format(m.rowCreatedAt,'dd.MM.yyyy HH:mm:ss')}"></span>
                   <i th:if="${m.readByReceiver}" class="fas fa-check"></i>
               </small>
           </span>