Update date-fns to 3.6.0

[Arnei]

Update dependency date-nfs to the newest version.
The new major version changed some import paths which had to be fixed.

Helps with #510.

[github-actions]

This pull request is deployed at test.admin-interface.opencast.org/514/2024-06-03_11-52-43/ .
It might take a few minutes for it to become available.

[github-actions]

Use docker or podman to test this pull request locally.

Run test server using develop.opencast.org as backend:

podman run --rm -it -p 127.0.0.1:3000:3000 ghcr.io/opencast/opencast-admin-interface:pr-514

Specify a different backend like stable.opencast.org:

podman run --rm -it -p 127.0.0.1:3000:3000 -e PROXY_TARGET=https://stable.opencast.org ghcr.io/opencast/opencast-admin-interface:pr-514

It may take a few seconds for the interface to spin up.
It will then be available at http://127.0.0.1:3000.
For more options you can pass on to the proxy, take a look at the README.md.

[ziegenberg]

Works as advertised.