Update base IRI in annotations.ttl to 3.0.1

[bact]

https://spdx.org/rdf/3.0.0/terms/ -> https://spdx.org/rdf/3.0.1/terms/

Around the time of release. This should be updated. So the publication CI can copy this file to the spec website.

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Current CI copies serialization/jsonld/annotations.ttl to docs/model/jsonld-annotations.ttl, which make it available at https://spdx.github.io/spdx-spec/v3.0.1-draft/model/jsonld-annotations.ttl (The exact destination path/URL may differ, according to #1066, but it is not effecting this PR)

[bact]

@JPEWdev please kindly correct me if I'm wrong. Thank you.

[bact]

Since the 3.0.1 CI is already up, we need this the change from this PR to be applied.

Currently https://spdx.github.io/spdx-spec/v3.0.1/rdf/jsonld-annotations.ttl has @base <https://spdx.org/rdf/3.0.0/terms/> ., it needs to be updated.

ping @goneall @zvr