1.0 beta 8

This is a prerelease of pySBOL3.

What's Changed

• Bump version to 1.0b8 by @tcmitchell in #313
• Update cardinality of Interface properties by @tcmitchell in #317
• Update cardinality of Component.interface property by @tcmitchell in #318
• Require rdflib 6.0.1 or higher by @tcmitchell in #319
• Propagate the new document pointer after copy by @tcmitchell in #322

Full Changelog: v1.0b7...v1.0b8