TF-3786 Add Return-Path header when request read receipt (#3790)

model/lib/extensions/email_extension.dart

@@ -231,6 +231,7 @@ extension EmailExtension on Email {
     Map<PartId, EmailBodyValue>? bodyValues,
     Map<IndividualHeaderIdentifier, String?>? headerUserAgent,
     Map<IndividualHeaderIdentifier, String?>? headerMdn,
+    Map<IndividualHeaderIdentifier, String?>? headerReturnPath,
     Map<IndividualHeaderIdentifier, String?>? headerCalendarEvent,
     Map<IndividualHeaderIdentifier, String?>? sMimeStatusHeader,
     Map<IndividualHeaderIdentifier, String?>? identityHeader,
@@ -267,6 +268,7 @@ extension EmailExtension on Email {
       bodyValues: bodyValues ?? this.bodyValues,
       headerUserAgent: headerUserAgent ?? this.headerUserAgent,
       headerMdn: headerMdn ?? this.headerMdn,
+      headerReturnPath: headerReturnPath ?? this.headerReturnPath,
       headerCalendarEvent: headerCalendarEvent ?? this.headerCalendarEvent,
       sMimeStatusHeader: sMimeStatusHeader ?? this.sMimeStatusHeader,
       identityHeader: identityHeader ?? this.identityHeader,

model/pubspec.lock

@@ -661,7 +661,7 @@ packages:
     description:
       path: "."
       ref: main
-      resolved-ref: d24ee7f6fe8a4917ffb658b0d295268b9ccced38
+      resolved-ref: "446efbbccdde981371b4d2a636762184adf6e926"
       url: "https://github.com/linagora/jmap-dart-client.git"
     source: git
     version: "0.3.6"