Change the version of rdflib in requirements.txt to rdflib >= 6.0.2, <=6.1.1

[st143575]

For python3.11, executing ontology_viz.py raises the following error: Traceback (most recent call last): File ".../ontology-visualization-master/ontology_viz.py", line 6, in from rdflib.plugins.sparql import prepareQuery File ".../condaenvs/ontology_vis/lib/python3.11/site-packages/rdflib/plugins/sparql/init.py", line 33, in from . import parser File ".../condaenvs/ontology_vis/lib/python3.11/site-packages/rdflib/plugins/sparql/parser.py", line 198, in PNAME_NS = Optional(Param("prefix", PN_PREFIX)) + Suppress(":").leaveWhitespace() ^^^^^^^^^^^^^^^^^^^^^^^^^^ File ".../condaenvs/ontology_vis/lib/python3.11/site-packages/rdflib/plugins/sparql/parserutils.py", line 114, in init self.name = name ^^^^^^^^^ AttributeError: property 'name' of 'Param' object has no setter