chore(#95): bump version to 1.1.2+30 for first public Windows release

Was 1.1.1+18. Tags already referenced 1.1.2 (v1.1.2-ble-test/-queuediag) and the
rc8/rc9 APKs shipped +28/+29 via --build-number, so the pubspec build number had
drifted. +30 is the next build after the +29 that shipped. Tag v1.1.2 at release.

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: 1.1.1+18
+version: 1.1.2+30
 
 environment:
   sdk: ^3.9.2