Bump certifi in /examples/NLU/examples/research_projects/lxmert

Bumps [certifi](https://github.com/certifi/python-certifi) from 2022.12.7 to 2023.7.22.
- [Commits](https://github.com/certifi/python-certifi/compare/2022.12.07...2023.07.22)

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

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

examples/NLU/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==2022.12.7
+certifi==2023.7.22
 cffi==1.14.2
 chardet==3.0.4
 click==7.1.2