chore(all): bump fastify from 5.5.0 to 5.6.0

Bumps [fastify](https://github.com/fastify/fastify) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/fastify/fastify/releases)
- [Commits](fastify/fastify@v5.5.0...v5.6.0)

---
updated-dependencies:
- dependency-name: fastify
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "argon2": "^0.44.0",
     "better-sqlite3": "^12.2.0",
     "drizzle-orm": "^0.44.5",
-    "fastify": "^5.4.0",
+    "fastify": "^5.6.0",
     "fastify-favicon": "^5.0.0",
     "lucia": "^3.2.2",
     "nanoid": "^3.3.11",

services/backend/package.json

@@ -18,7 +18,7 @@
     "@fastify/swagger": "^9.5.1",
     "@fastify/swagger-ui": "^5.2.3",
     "dotenv": "^16.4.5",
-    "fastify": "^5.4.0",
+    "fastify": "^5.6.0",
     "pino": "^9.9.0",
     "pino-pretty": "^13.1.1"
   },