Bump certifi from 2018.10.15 to 2022.12.7

Bumps [certifi](https://github.com/certifi/python-certifi) from 2018.10.15 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2018.10.15...2022.12.07)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,6 +1,6 @@
 absl-py==0.6.1
 astor==0.7.1
-certifi==2018.10.15
+certifi==2022.12.7
 chardet==3.0.4
 cloudpickle==0.6.1
 cycler==0.10.0