Bump certifi in /examples/research_projects/decision_transformer (#20677)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.10.8 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](https://github.com/certifi/python-certifi/compare/2021.10.08...2022.12.07

)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: direct:production
...
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examples/research_projects/decision_transformer/requirements.txt

@@ -20,7 +20,7 @@ boto3==1.16.34
 botocore==1.19.63
 Brotli==1.0.9
 cachetools==5.0.0
-certifi==2021.10.8
+certifi==2022.12.7
 cffi==1.15.0
 chardet==4.0.0
 charset-normalizer==2.0.12