Update SBO

[luciansmith]

At least for the online validator, I get this error:

Warning Line 2 Column 34: (SBML Validation Rule #10719) The value of the 'sboTerm' attribute on the object is expected to be an SBO identifier (http://www.biomodels.net/SBO/) referring to a modeling framework (i.e., terms derived from SBO:0000004, "modelling framework"). Reference: L3V2 Section 5 SBO:0000675 does not derive from the modelling framework branch.

However, 675 does indeed inherit from 4, but it was added more recently. We just need to pull in the latest SBO ontology.