Log Message:
py-rdflib: updated to 7.1.1

7.1.1

This minor release removes the dependency on some only Python packages, in
particular six which is a problem for some Linux distributions that ship
RDFLib.

Other than that, there are a few minor PRs that improve testing and to do with
making releases - no
new RDFLib core work.

7.1.0

This minor release incorporates just over 100 substantive PRs - interesting
things submitted by people - and around 140 auto-generated update PRs from
dependabot and similar.

There are no major changes in this release over 7.0.0 and this release can be
used in place of 7.0.0 without much worry about altered behaviour.