package/python-networkx: bump to version 3.0

Drop no longer required decorator dependency.

License hash changed due to year update:
https://github.com/networkx/networkx/commit/49f20fe11d2a804a83d538759e06511eb90ad5a3



Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>