Bump fastify-formbody from 3.2.0 to 4.0.3

Bumps [fastify-formbody](https://github.com/fastify/fastify-formbody) from 3.2.0 to 4.0.3.
- [Release notes](https://github.com/fastify/fastify-formbody/releases)
- [Commits](fastify/fastify-formbody@v3.2.0...v4.0.3)

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

package.json

@@ -45,7 +45,7 @@
     "@types/node": "^13.9.1",
     "ajv": "^6.12.0",
     "fastify-env": "^1.0.1",
-    "fastify-formbody": "^3.1.0",
+    "fastify-formbody": "^4.0.3",
     "fastify-plugin": "^1.6.1",
     "http-errors": "^1.7.3",
     "simple-get": "^3.1.0"