build(deps): bump certifi from 2020.11.8 to 2020.12.5

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.11.8 to 2020.12.5.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2020.11.08...2020.12.05)

Signed-off-by: dependabot[bot] <support@github.com>

test-requirements.txt

@@ -27,9 +27,9 @@ babel==2.9.0 \
 black==20.8b1 \
     --hash=sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea \
     # via -r test-requirements.in
-certifi==2020.11.8 \
-    --hash=sha256:1f422849db327d534e3d0c5f02a263458c3955ec0aae4ff09b95f195c59f4edd \
-    --hash=sha256:f05def092c44fbf25834a51509ef6e631dc19765ab8a57b4e7ab85531f0a9cf4 \
+certifi==2020.12.5 \
+    --hash=sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c \
+    --hash=sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830 \
     # via requests
 chardet==3.0.4 \
     --hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae \