Bump pyarrow from 1.0.1 to 15.0.0 in /examples/research_projects/lxmert (#30584)

Bumps [pyarrow](https://github.com/apache/arrow) from 1.0.1 to 15.0.0.
- [Commits](https://github.com/apache/arrow/compare/apache-arrow-1.0.1...go/v15.0.0

)

---
updated-dependencies:
- dependency-name: pyarrow
  dependency-type: direct:production
...
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examples/research_projects/lxmert/requirements.txt

@@ -62,7 +62,7 @@ prometheus-client==0.8.0
 prompt-toolkit==3.0.7
 ptyprocess==0.6.0
 pyaml==20.4.0
-pyarrow==1.0.1
+pyarrow==15.0.0
 pycparser==2.20
 Pygments>=2.7.4
 pyparsing==2.4.6