Update platform_channels (#2013)

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] All existing and new tests are passing.

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[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[CLA]: https://cla.developers.google.com/
[Discord]: https://github.com/flutter/flutter/wiki/Chat
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

platform_channels/.metadata

@@ -4,8 +4,8 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: "ac71592bc605996f9376ec5b7607db52b64cabd0"
-  channel: "beta"
+  revision: "2524052335ec76bb03e04ede244b071f1b86d190"
+  channel: "stable"
 
 project_type: app
 
@@ -13,14 +13,14 @@ project_type: app
 migration:
   platforms:
     - platform: root
-      create_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
-      base_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
+      create_revision: 2524052335ec76bb03e04ede244b071f1b86d190
+      base_revision: 2524052335ec76bb03e04ede244b071f1b86d190
     - platform: android
-      create_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
-      base_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
+      create_revision: 2524052335ec76bb03e04ede244b071f1b86d190
+      base_revision: 2524052335ec76bb03e04ede244b071f1b86d190
     - platform: ios
-      create_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
-      base_revision: ac71592bc605996f9376ec5b7607db52b64cabd0
+      create_revision: 2524052335ec76bb03e04ede244b071f1b86d190
+      base_revision: 2524052335ec76bb03e04ede244b071f1b86d190
 
   # User provided section