chore(#265): bump version to 1.1.2-rc.3+60 for the closed-test update

Cut v1.1.2-rc.3 (rc.2+59 -> rc.3+60). versionCode 60 clears 59, the build
currently live in closed testing, keeping the Play line strictly increasing.

Carries 21 commits since v1.1.2-rc.2: per-channel notify levels (epic #259,
hardware-tested), firmware block offload (#176-#180), block gating (#252),
USB VID gate (#248), reply/mention/GIF UX (#235/#238), path-len decode
(#224), and flutter_local_notifications 20 -> 22 (#242).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.1.2-rc.2+59
+version: 1.1.2-rc.3+60
 
 environment:
   sdk: ^3.9.2