build: Update matrix dart sdk to 0.40.0

Signed-off-by: Christian Kußowski <c.kussowski@famedly.com>

lib/utils/matrix_sdk_extensions/matrix_locals.dart

@@ -1,4 +1,5 @@
 import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:intl/intl.dart';
 import 'package:matrix/matrix.dart';
 
 /// This is a temporary helper class until there is a proper solution to this with the new system
@@ -350,4 +351,21 @@ class MatrixLocals extends MatrixLocalizations {
 
   @override
   String get cancelledSend => l10n.sendCanceled;
+
+  @override
+  String voiceMessage(String senderName, Duration? duration) {
+    final dateTime = duration == null
+        ? null
+        : DateTime.fromMillisecondsSinceEpoch(
+            duration.inSeconds * 1000,
+          );
+    final formattedDuration = dateTime == null
+        ? ''
+        : DateFormat(
+            DateFormat.MINUTE_SECOND,
+            l10n.localeName,
+          ).format(dateTime);
+
+    return l10n.sentVoiceMessage(senderName, formattedDuration);
+  }
 }