ci: bump pytype to 2022.11.18

No particular reason, other than the current build is fairly old.  It flagged a
few more things (that weren't errors based on the logic around them), but OTOH,
some of the pyi stubs it generates are less specific.

contrib/heptapod-ci.yml

@@ -89,7 +89,7 b' check-pytype:'
       - hg -R /tmp/mercurial-ci/ update `hg log --rev '.' --template '{node}'`
       - cd /tmp/mercurial-ci/
       - make local PYTHON=$PYTHON
-      - $PYTHON -m pip install --user -U libcst==0.3.20 pytype==2022.03.29
+      - $PYTHON -m pip install --user -U libcst==0.3.20 pytype==2022.11.18
       - ./contrib/setup-pytype.sh
     script:
       - echo "Entering script section"