pytype: drop py3.6 support

Pytype 2022.01.07 only supports 3.7+.

Differential Revision: https://phab.mercurial-scm.org/D12400

tests/test-check-pytype.t

@@ -1,73 +1,71 b''
 #require pytype py3 slow
 
   $ cd $RUNTESTDIR/..
 
 Many of the individual files that are excluded here confuse pytype
 because they do a mix of Python 2 and Python 3 things
 conditionally. There's no good way to help it out with that as far as
 I can tell, so let's just hide those files from it for now. We should
 endeavor to empty this list out over time, as some of these are
 probably hiding real problems.
 
 mercurial/bundlerepo.py       # no vfs and ui attrs on bundlerepo
 mercurial/context.py          # many [attribute-error]
 mercurial/crecord.py          # tons of [attribute-error], [module-attr]
 mercurial/debugcommands.py    # [wrong-arg-types]
 mercurial/dispatch.py         # initstdio: No attribute ... on TextIO [attribute-error]
 mercurial/exchange.py         # [attribute-error]
 mercurial/hgweb/hgweb_mod.py  # [attribute-error], [name-error], [wrong-arg-types]
 mercurial/hgweb/server.py     # [attribute-error], [name-error], [module-attr]
 mercurial/hgweb/wsgicgi.py    # confused values in os.environ
 mercurial/httppeer.py         # [attribute-error], [wrong-arg-types]
 mercurial/interfaces          # No attribute 'capabilities' on peer [attribute-error]
 mercurial/keepalive.py        # [attribute-error]
 mercurial/localrepo.py        # [attribute-error]
 mercurial/manifest.py         # [unsupported-operands], [wrong-arg-types]
 mercurial/minirst.py          # [unsupported-operands], [attribute-error]
 mercurial/pure/osutil.py      # [invalid-typevar], [not-callable]
 mercurial/pure/parsers.py     # [attribute-error]
 mercurial/repoview.py         # [attribute-error]
 mercurial/testing/storage.py  # tons of [attribute-error]
 mercurial/ui.py               # [attribute-error], [wrong-arg-types]
 mercurial/unionrepo.py        # ui, svfs, unfiltered [attribute-error]
-mercurial/utils/memorytop.py  # not 3.6 compatible
 mercurial/win32.py            # [not-callable]
 mercurial/wireprotoframing.py # [unsupported-operands], [attribute-error], [import-error]
 mercurial/wireprotov1peer.py  # [attribute-error]
 mercurial/wireprotov1server.py  # BUG?: BundleValueError handler accesses subclass's attrs
 
 TODO: use --no-cache on test server?  Caching the files locally helps during
 development, but may be a hinderance for CI testing.
 
-  $ pytype -V 3.6 --keep-going --jobs auto mercurial \
+  $ pytype -V 3.7 --keep-going --jobs auto mercurial \
   >    -x mercurial/bundlerepo.py \
   >    -x mercurial/context.py \
   >    -x mercurial/crecord.py \
   >    -x mercurial/debugcommands.py \
   >    -x mercurial/dispatch.py \
   >    -x mercurial/exchange.py \
   >    -x mercurial/hgweb/hgweb_mod.py \
   >    -x mercurial/hgweb/server.py \
   >    -x mercurial/hgweb/wsgicgi.py \
   >    -x mercurial/httppeer.py \
   >    -x mercurial/interfaces \
   >    -x mercurial/keepalive.py \
   >    -x mercurial/localrepo.py \
   >    -x mercurial/manifest.py \
   >    -x mercurial/minirst.py \
   >    -x mercurial/pure/osutil.py \
   >    -x mercurial/pure/parsers.py \
   >    -x mercurial/repoview.py \
   >    -x mercurial/testing/storage.py \
   >    -x mercurial/thirdparty \
   >    -x mercurial/ui.py \
   >    -x mercurial/unionrepo.py \
-  >    -x mercurial/utils/memorytop.py \
   >    -x mercurial/win32.py \
   >    -x mercurial/wireprotoframing.py \
   >    -x mercurial/wireprotov1peer.py \
   >    -x mercurial/wireprotov1server.py \
   >  > $TESTTMP/pytype-output.txt || cat $TESTTMP/pytype-output.txt
 
 Only show the results on a failure, because the output on success is also
 voluminous and variable.