Update warning filters for Python 3.11.0b1 etc

Python 3.11.0b1 adds new deprecation warnings for "dead batteries"
in the stdlib, both for our dependencies and ourself (telnetlib is
used a bit in the selftest). Also some new warnings are cropping up
with pip 22 and SetupTools 62, so filter those for now until they're
solved. Drop a filter for deprecated sre_constants use in the
pkg_resources vendored version of pyparsing which has recently been
updated.