build: Update matrix dart sdk

lib/pages/chat/chat.dart

@@ -763,7 +763,7 @@ class ChatController extends State<ChatPageWithRoom>
         );
       }
       for (final event in selectedEvents) {
-        await event.remove();
+        await event.cancelSend();
       }
       setState(selectedEvents.clear);
     } catch (e, s) {
@@ -813,7 +813,7 @@ class ChatController extends State<ChatPageWithRoom>
               );
             }
           } else {
-            await event.remove();
+            await event.cancelSend();
           }
         },
       );

lib/pages/settings_multiple_emotes/settings_multiple_emotes_view.dart

@@ -25,9 +25,9 @@ class MultipleEmotesSettingsView extends StatelessWidget {
         builder: (context, snapshot) {
           final packStateEvents = room.states['im.ponies.room_emotes'];
           // we need to manually convert the map using Map.of, otherwise assigning null will throw a type error.
-          final Map<String, Event?> packs = packStateEvents != null
-              ? Map<String, Event?>.of(packStateEvents)
-              : <String, Event?>{};
+          final packs = packStateEvents != null
+              ? Map<String, StrippedStateEvent?>.of(packStateEvents)
+              : <String, StrippedStateEvent?>{};
           if (!packs.containsKey('')) {
             packs[''] = null;
           }

lib/pages/user_bottom_sheet/user_bottom_sheet.dart

@@ -127,11 +127,12 @@ class UserBottomSheetController extends State<UserBottomSheet> {
           textFields: [DialogTextField(hintText: L10n.of(context)!.reason)],
         );
         if (reason == null || reason.single.isEmpty) return;
+
         final result = await showFutureLoadingDialog(
           context: context,
           future: () => Matrix.of(widget.outerContext).client.reportContent(
-                user.roomId!,
-                user.eventId,
+                user.room.id,
+                user.id,
                 reason: reason.single,
                 score: score,
               ),