[auth] fix unknown hard error on windows (#6360)

## Description

Fixes https://github.com/ente-io/ente/issues/5789
https://github.com/ente-io/ente/issues/4523
https://github.com/ente-io/ente/issues/4099
https://github.com/ente-io/ente/issues/4270

## Tests

auth/pubspec.lock

@@ -543,67 +543,74 @@ packages:
   flutter_inappwebview:
     dependency: "direct main"
     description:
-      name: flutter_inappwebview
-      sha256: "80092d13d3e29b6227e25b67973c67c7210bd5e35c4b747ca908e31eb71a46d5"
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.1.5"
+      path: flutter_inappwebview
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "6.2.0-beta.3"
   flutter_inappwebview_android:
     dependency: transitive
     description:
-      name: flutter_inappwebview_android
-      sha256: "62557c15a5c2db5d195cb3892aab74fcaec266d7b86d59a6f0027abd672cddba"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.3"
+      path: flutter_inappwebview_android
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "1.2.0-beta.3"
   flutter_inappwebview_internal_annotations:
     dependency: transitive
     description:
       name: flutter_inappwebview_internal_annotations
-      sha256: "5f80fd30e208ddded7dbbcd0d569e7995f9f63d45ea3f548d8dd4c0b473fb4c8"
+      sha256: "787171d43f8af67864740b6f04166c13190aa74a1468a1f1f1e9ee5b90c359cd"
       url: "https://pub.dev"
     source: hosted
-    version: "1.1.1"
+    version: "1.2.0"
   flutter_inappwebview_ios:
     dependency: transitive
     description:
-      name: flutter_inappwebview_ios
-      sha256: "5818cf9b26cf0cbb0f62ff50772217d41ea8d3d9cc00279c45f8aabaa1b4025d"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
+      path: flutter_inappwebview_ios
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "1.2.0-beta.3"
   flutter_inappwebview_macos:
     dependency: transitive
     description:
-      name: flutter_inappwebview_macos
-      sha256: c1fbb86af1a3738e3541364d7d1866315ffb0468a1a77e34198c9be571287da1
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
+      path: flutter_inappwebview_macos
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "1.2.0-beta.3"
   flutter_inappwebview_platform_interface:
     dependency: transitive
     description:
-      name: flutter_inappwebview_platform_interface
-      sha256: cf5323e194096b6ede7a1ca808c3e0a078e4b33cc3f6338977d75b4024ba2500
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.3.0+1"
+      path: flutter_inappwebview_platform_interface
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "1.4.0-beta.3"
   flutter_inappwebview_web:
     dependency: transitive
     description:
-      name: flutter_inappwebview_web
-      sha256: "55f89c83b0a0d3b7893306b3bb545ba4770a4df018204917148ebb42dc14a598"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.2"
+      path: flutter_inappwebview_web
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "1.2.0-beta.3"
   flutter_inappwebview_windows:
     dependency: transitive
     description:
-      name: flutter_inappwebview_windows
-      sha256: "8b4d3a46078a2cdc636c4a3d10d10f2a16882f6be607962dbfff8874d1642055"
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.6.0"
+      path: flutter_inappwebview_windows
+      ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      resolved-ref: "3e6c4c4a25340cd363af9d38891d88498b90be26"
+      url: "https://github.com/pichillilorenzo/flutter_inappwebview.git"
+    source: git
+    version: "0.7.0-beta.3"
   flutter_launcher_icons:
     dependency: "direct main"
     description:

auth/pubspec.yaml

@@ -45,7 +45,13 @@ dependencies:
   flutter_context_menu: ^0.2.0
   flutter_displaymode: ^0.6.0
   flutter_email_sender: ^6.0.2
-  flutter_inappwebview: ^6.1.5
+  # revert to pub.dev when merged
+  # https://github.com/pichillilorenzo/flutter_inappwebview/pull/2548
+  flutter_inappwebview:
+    git:
+      url: https://github.com/pichillilorenzo/flutter_inappwebview.git
+      path: flutter_inappwebview
+      ref: 3e6c4c4a25340cd363af9d38891d88498b90be26
   flutter_launcher_icons: ^0.14.1
   flutter_local_authentication:
     git: