chore: bump version to 2026.5.4

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: richardthe3rd

pubspec.yaml

@@ -1,7 +1,7 @@
 name: cambridge_beer_festival
 description: A Flutter app for Cambridge Beer Festival - browse beers, ciders, meads, and more.
 publish_to: 'none'
-version: 2026.5.3+20260510
+version: 2026.5.4+20260511
 
 environment:
   sdk: '>=3.2.0 <4.0.0'