Bump certifi in /examples/research_projects/lxmert (#20672)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.6.20 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2020.06.20...2022.12.07)

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

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examples/research_projects/lxmert/requirements.txt

@@ -4,7 +4,7 @@ async-generator==1.10
 attrs==20.2.0
 backcall==0.2.0
 CacheControl==0.12.6
-certifi==2020.6.20
+certifi==2022.12.7
 cffi==1.14.2
 chardet==3.0.4
 click==7.1.2