Bump friendsofsymfony/rest-bundle from 2.8.6 to 3.4.0

Bumps [friendsofsymfony/rest-bundle](https://github.com/FriendsOfSymfony/FOSRestBundle) from 2.8.6 to 3.4.0.
- [Release notes](https://github.com/FriendsOfSymfony/FOSRestBundle/releases)
- [Changelog](https://github.com/FriendsOfSymfony/FOSRestBundle/blob/3.x/CHANGELOG.md)
- [Commits](https://github.com/FriendsOfSymfony/FOSRestBundle/compare/2.8.6...3.4.0)

---
updated-dependencies:
- dependency-name: friendsofsymfony/rest-bundle
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

composer.json

@@ -68,7 +68,7 @@
         "enshrined/svg-sanitize": "^0.15.4",
         "friendsofsymfony/jsrouting-bundle": "^2.2",
         "friendsofsymfony/oauth-server-bundle": "^1.5",
-        "friendsofsymfony/rest-bundle": "~2.1",
+        "friendsofsymfony/rest-bundle": "~3.4",
         "friendsofsymfony/user-bundle": "^3.1",
         "guzzlehttp/guzzle": "^5.3.1",
         "guzzlehttp/psr7": "^1.8",