chore: post 6.3.1 release tasks (#2290)

Author: aucampia

docker/latest/requirements.in

@@ -1,4 +1,4 @@
 # This file is used for building a docker image of hte latest rdflib release. It
 # will be updated by dependabot when new releases are made.
-rdflib==6.3.0
+rdflib==6.3.1
 html5lib

docker/latest/requirements.txt

@@ -10,7 +10,7 @@ isodate==0.6.1
     # via rdflib
 pyparsing==3.0.9
     # via rdflib
-rdflib==6.3.0
+rdflib==6.3.1
     # via -r docker/latest/requirements.in
 six==1.16.0
     # via

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "rdflib"
-version = "6.3.1"
+version = "6.4.0a0"
 description = """RDFLib is a Python library for working with RDF, \
 a simple yet powerful language for representing information."""
 authors = ["Daniel 'eikeon' Krech <eikeon@eikeon.com>"]