Bump i18n to 9e2d0473aa26f8cd426d7e37aca0247713009104

Changes:
```
> git log --format="%C(auto) %h %s" 43214dd..9e2d047
 https://dart.googlesource.com/i18n.git/+/9e2d0473 Throw if the main argument in plurals does not match the argument list. (873)
 https://dart.googlesource.com/i18n.git/+/973f331c Add comment to package:intl pubspec. (980)
 https://dart.googlesource.com/i18n.git/+/6c846bfd Add extensions on `Collation` and `List` (881)
 https://dart.googlesource.com/i18n.git/+/a1168b74 Use new artifacts for case mapping (982)
 https://dart.googlesource.com/i18n.git/+/874feb26 Add locale-sensitive casing (880)
 https://dart.googlesource.com/i18n.git/+/5b339258 Use new artifacts in `package:intl4x` (981)
 https://dart.googlesource.com/i18n.git/+/c40bee51 feat!: allow analyzer 7.0.0 and update dart_style to ^3.0.0 (970)
 https://dart.googlesource.com/i18n.git/+/e24ed1ab Update to package:intl4x (977)

```

Diff: https://dart.googlesource.com/i18n.git/+/43214dde639f496377b6151115d1415128298c53..9e2d0473aa26f8cd426d7e37aca0247713009104/
Change-Id: I5ba299041e413de5f60270820e463ec8f2976b32
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/437940
Reviewed-by: Moritz Sümmermann <[email protected]>
Auto-Submit: Devon Carew <[email protected]>
Commit-Queue: Moritz Sümmermann <[email protected]>

Author: devoncarew

DEPS

@@ -137,7 +137,7 @@ vars = {
   "ecosystem_rev": "d5233c6dd0767cffa5742e32c4bc7c230c9c4b12",
   "flute_rev": "e4ea0459a7debae5e9592c85141707b01fac86c9",
   "http_rev": "e70a41b8b841ada9ba124b3b9e1a4d3c525b8bf9",
-  "i18n_rev": "43214dde639f496377b6151115d1415128298c53",
+  "i18n_rev": "9e2d0473aa26f8cd426d7e37aca0247713009104",
   "leak_tracker_rev": "f5620600a5ce1c44f65ddaa02001e200b096e14c", # rolled manually
   "material_color_utilities_rev": "799b6ba2f3f1c28c67cc7e0b4f18e0c7d7f3c03e",
   "native_rev": "7944c5a0d26f3948273096239c9c2a8d6f0cda54", # rolled manually while native assets are experimental