IGAPP-833: Upgrade react-router to v6

[jira-to-github-migrator-test[bot]]

Steffen Kleinle - 10.11.2021, 15:54:23

See https://reactrouter.com/docs/en/v6/upgrading/v5#upgrade-to-react-router-v6

Also look into upgrading path-to-regexp.

Environment: - Linked issues:

• Relates: IGAPP-829