chore(deps-dev): bump pytype from 2020.11.23 to 2020.12.2

Bumps [pytype](https://github.com/google/pytype) from 2020.11.23 to 2020.12.2.
- [Release notes](https://github.com/google/pytype/releases)
- [Changelog](https://github.com/google/pytype/blob/master/CHANGELOG)
- [Commits](google/pytype@2020.11.23...2020.12.02)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements/dev.txt

@@ -6,6 +6,6 @@ pep8==1.7.1
 isort==5.6.4
 black==20.8b1
 pre-commit==2.9.2
-pytype==2020.11.23
+pytype==2020.12.2
 pycln==0.0.1b0
 pyupgrade==2.7.4