Merge branch '6.4' into 7.0

* 6.4:
  [Form] Fix merging form data and files (ter)
  [Intl] Update the ICU data to 74.1
  [Scheduler] Use MockClock
  [AssetMapper] Fixing memory bug where we stored way more file content than needed
  [AssetMapper] jsdelivr "no version" import syntax
  [HtmlSanitizer] Consider `width` attribute as safe
  [DoctrineBridge] Fix exception message
  [Security][Validator] Missing translations for Luxembourgish

Resources/translations/security.lb.xlf

@@ -70,6 +70,14 @@
                 <source>Invalid or expired login link.</source>
                 <target>Ongëltegen oder ofgelafene Login-Link.</target>
             </trans-unit>
+            <trans-unit id="19">
+                <source>Too many failed login attempts, please try again in %minutes% minute.</source>
+                <target>Zu vill fehlgeschloen Loginversich, w. e. g. probéiert nach am %minutes% Minutt.</target>
+            </trans-unit>
+            <trans-unit id="20">
+                <source>Too many failed login attempts, please try again in %minutes% minutes.</source>
+                <target>Zu vill fehlgeschloen Loginversich, w. e. g. probéiert nach an %minutes% Minutten.</target>
+            </trans-unit>
         </body>
     </file>
 </xliff>