chore(release): train-v0.3.0

Build 3.

Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/halkyon_train_flutter/pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: none
 
 # <version>+<build>: the build rises with every release, and the instance asks apps below
 # its minimum build to update (halkyon_base's instance basics).
-version: 0.2.0+2
+version: 0.3.0+3
 
 environment:
   sdk: '^3.13.0'