Update certifi from 2019.9.11 to 2019.11.28 (pypa#400)

Author: pyup-bot

docker/build_scripts/py37-requirements.txt

@@ -1,8 +1,8 @@
 # pip requirements for cpython 3.7
 # NOTE: certifi has GPG signatures; could download and verify independently.
-certifi==2019.9.11 \
-    --hash=sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50 \
-    --hash=sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef
+certifi==2019.11.28 \
+    --hash=sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3 \
+    --hash=sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f
 auditwheel==2.1.1 \
     --hash=sha256:d9f0f47c0ecdf4f72316eabfb19223b81aec95f0deba97729e9c09ea4f2c166e \
     --hash=sha256:f60e265dc168ae7c9d65a814410881c5ca170d88644c178f8e3aa20eecd0fae1