build(deps): bump doctrine/orm from 2.18.0 to 3.0.1

Bumps [doctrine/orm](https://github.com/doctrine/orm) from 2.18.0 to 3.0.1.
- [Release notes](https://github.com/doctrine/orm/releases)
- [Upgrade guide](https://github.com/doctrine/orm/blob/3.0.x/UPGRADE.md)
- [Commits](doctrine/orm@2.18.0...3.0.1)

---
updated-dependencies:
- dependency-name: doctrine/orm
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

composer.json

@@ -19,7 +19,7 @@
     "doctrine/doctrine-fixtures-bundle": "^3.0",
     "doctrine/doctrine-migrations-bundle": "^3.1",
     "doctrine/inflector": "^2.0",
-    "doctrine/orm": "^2.9",
+    "doctrine/orm": "^3.0",
     "eluceo/ical": "^2.5.1",
     "exercise/htmlpurifier-bundle": "^5.0",
     "firebase/php-jwt": "@stable",