Bump pyarrow from 7.0.0 to 15.0.0 in /examples/research_projects/deci…

…sion_transformer (#30582)

Bump pyarrow in /examples/research_projects/decision_transformer

Bumps [pyarrow](https://github.com/apache/arrow) from 7.0.0 to 15.0.0.
- [Commits](apache/arrow@go/v7.0.0...go/v15.0.0)

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

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examples/research_projects/decision_transformer/requirements.txt

@@ -150,7 +150,7 @@ ptyprocess==0.7.0
 pure-eval==0.2.2
 py==1.11.0
 py-cpuinfo==8.0.0
-pyarrow==7.0.0
+pyarrow==15.0.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycodestyle==2.8.0