Bump fastify-plugin from 3.0.1 to 4.0.0 (#79)

Bumps [fastify-plugin](https://github.com/fastify/fastify-plugin) from 3.0.1 to 4.0.0.
- [Release notes](https://github.com/fastify/fastify-plugin/releases)
- [Commits](fastify/fastify-plugin@v3.0.1...v4.0.0)

---
updated-dependencies:
- dependency-name: fastify-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/fastify/fastify-kafka#readme",
   "dependencies": {
-    "fastify-plugin": "^3.0.0",
+    "fastify-plugin": "^4.0.0",
     "node-rdkafka": "^2.8.1"
   },
   "devDependencies": {