1.0 beta 9

This is a prerelease of pySBOL3.

What's Changed

• Bump version to 1.0b9 by @tcmitchell in #323
• Add Python 3.10 to GitHub Actions build by @tcmitchell in #326
• SBOL 3.0.1: ComponentReferenct.hasFeature -> ComponentReference.refersTo by @tcmitchell in #327
• Add a test for an rdflib json-ld bug by @tcmitchell in #330
• Check that namespace is a prefix of identity by @tcmitchell in #331
• Ensure namespace is a prefix of identity on object creation by @tcmitchell in #332
• Add collections of TopLevel via Document.add() by @tcmitchell in #333

Full Changelog: v1.0b8...v1.0b9