Update dependencies

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Removed «ns-doc» and replaced it with namespace docstrings

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Fixed implementation of concept approximations

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>