A fix-up release that re-adds support for Python 3.8 after it was accidentally
removed in Release 7.1.2.
This release cherrypicks many additions to 7.1.2 added to 7.1.1 but leaves out
typing changes that are not compatible
with Python 3.8.
Also not carried over from 7.1.2 is the change from Poetry 1.x to 2.0.
Included are PRs such as Defined Namespace warnings fix, sort longturtle
blank nodes, deterministic longturtle serialisation and Dataset documentation
improvements.