Use the defined URI for the created by organization for references

[goneall]

The reference to ns1:createdBy <https://spdx.org/> ; as the value of createdBy is failing validation in PyShacl.

Even though the OWL file declares this to be the sameAs ns1:SpdxOrganization, it is not finding the definition.

This may be due to no reasoner being implemented in the PyShacl.

Change the references from ns1:createdBy <https://spdx.org/> ; to ns1:createdBy ns1:SpdxOrganization passes validatin.

Reference comment spdx/spdx-3-model#936 (comment)

[zvr]

OK, this does not make sense.
I'm thinking that this is a limitation of PyShacl.

We can do the change to circumvent it, but let's try another SHACL tester before to see where the issue is.

[goneall]

OK, this does not make sense. I'm thinking that this is a limitation of PyShacl.

We can do the change to circumvent it, but let's try another SHACL tester before to see where the issue is.

This matches a pattern I've seen in RDF tooling where anything that would involve indirect reasoning requires additional plugins or just doesn't work. Even if this is a limitation of PyShacl, we should probably keep the change since PyShacl has a substantial user base.