heptapod-ci: use shell script in pytype step

contrib/heptapod-ci.yml

@@ -90,11 +90,11 b' check-pytype:'
       - cd /tmp/mercurial-ci/
       - make local PYTHON=$PYTHON
       - $PYTHON -m pip install --user -U pytype==2021.04.15
+    script:
+      - echo "Entering script section"
+      - sh contrib/check-pytype.sh
     variables:
-        RUNTEST_ARGS: " --allow-slow-tests tests/test-check-pytype.t"
-        HGTEST_SLOWTIMEOUT: "3600"
         PYTHON: python3
-        TEST_HGMODULEPOLICY: "c"
 
 # `sh.exe --login` sets a couple of extra environment variables that are defined
 # in the MinGW shell, but switches CWD to /home/$username.  The previous value