Bump joblib in /examples/research_projects/decision_transformer (#19270)

Bumps [joblib](https://github.com/joblib/joblib) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/joblib/joblib/releases)
- [Changelog](https://github.com/joblib/joblib/blob/master/CHANGES.rst)
- [Commits](https://github.com/joblib/joblib/compare/1.1.0...1.2.0)

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

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examples/research_projects/decision_transformer/requirements.txt

@@ -95,7 +95,7 @@ jedi==0.18.1
 Jinja2==2.11.3
 jinja2-time==0.2.0
 jmespath==0.10.0
-joblib==1.1.0
+joblib==1.2.0
 jsonschema==4.4.0
 keras==2.8.0
 Keras-Preprocessing==1.1.2