build(deps): bump @fastify/deepmerge from 1.3.0 to 2.0.0

Bumps [@fastify/deepmerge](https://github.com/fastify/deepmerge) from 1.3.0 to 2.0.0.
- [Release notes](https://github.com/fastify/deepmerge/releases)
- [Commits](fastify/deepmerge@v1.3.0...v2.0.0)

---
updated-dependencies:
- dependency-name: "@fastify/deepmerge"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -46,7 +46,7 @@
     "tsd": "^0.31.0"
   },
   "dependencies": {
-    "@fastify/deepmerge": "^1.3.0"
+    "@fastify/deepmerge": "^2.0.0"
   },
   "pre-commit": [
     "lint",