chore(addon): set addon.yml api-version to BentoBox 3.14

The api-version in addon.yml declares the minimum required BentoBox
core version. Bump from the stale 1.15.4 to 3.14 to match the version
the addon is built against.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014sAme6FF7XcS7ebwdVp4CG

Author: tastybento

src/main/resources/addon.yml

@@ -2,7 +2,7 @@ name: Chat
 main: world.bentobox.chat.Chat
 version: ${version}${build.number}
 icon: WRITABLE_BOOK
-api-version: 1.15.4
+api-version: 3.14
 
 softdepend: BSkyBlock, AcidIsland, SkyGrid, CaveBlock, AOneBlock