chore: bump version to 2.5.5 (#56)

Release bump to trigger Docker publish.

**Includes since v2.5.4:**
- Security: patched 5 hono CVEs via updated lock file (via
`@modelcontextprotocol/sdk` transitive deps)
- `tsx` 4.21.0, `@types/node` 25.3.5, `typescript` 5.9.3
- CI/tooling: codeql, cache, checkout, setup-node, scorecard action
updates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Paradoxbound <paradoxbound@paradoxbound.org>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 3 people

packages/stdio/package.json

@@ -1,6 +1,6 @@
 {
   "name": "bookstack-mcp-stdio",
-  "version": "2.5.4",
+  "version": "2.5.5",
   "description": "BookStack MCP server (stdio transport)",
   "type": "module",
   "main": "dist/index.js",