Remove obsolete dependency (#690)

Mastodon.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -217,15 +217,6 @@
           "version": "2.13.0"
         }
       },
-      {
-        "package": "ThirdPartyMailer",
-        "repositoryURL": "https://github.com/vtourraine/ThirdPartyMailer.git",
-        "state": {
-          "branch": null,
-          "revision": "44c1cfaa6969963f22691aa67f88a69e3b6d651f",
-          "version": "2.1.0"
-        }
-      },
       {
         "package": "TOCropViewController",
         "repositoryURL": "https://github.com/TimOliver/TOCropViewController.git",

Mastodon/Scene/Onboarding/ConfirmEmail/MastodonConfirmEmailViewController.swift

@@ -8,7 +8,6 @@
 import Combine
 import MastodonSDK
 import os.log
-import ThirdPartyMailer
 import UIKit
 import MastodonAsset
 import MastodonCore

MastodonSDK/Package.swift

@@ -53,7 +53,6 @@ let package = Package(
         .package(url: "https://github.com/TwidereProject/MetaTextKit.git", exact: "2.2.5"),
         .package(url: "https://github.com/TwidereProject/TabBarPager.git", from: "0.1.0"),
         .package(url: "https://github.com/uias/Tabman", from: "2.13.0"),
-        .package(url: "https://github.com/vtourraine/ThirdPartyMailer.git", from: "2.1.0"),
         .package(url: "https://github.com/woxtu/UIHostingConfigurationBackport.git", from: "0.1.0"),
         .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.12.0"),
         .package(url: "https://github.com/eneko/Stripes.git", from: "0.2.0"),
@@ -126,7 +125,6 @@ let package = Package(
                 .product(name: "UITextView+Placeholder", package: "UITextView-Placeholder"),
                 .product(name: "UIHostingConfigurationBackport", package: "UIHostingConfigurationBackport"),
                 .product(name: "TabBarPager", package: "TabBarPager"),
-                .product(name: "ThirdPartyMailer", package: "ThirdPartyMailer"),
                 .product(name: "OrderedCollections", package: "swift-collections"),
                 .product(name: "Tabman", package: "Tabman"),
                 .product(name: "MetaTextKit", package: "MetaTextKit"),