Update pyarrow requirement from <15,>=6.0.1 to >=6.0.1,<16 (#344)

Updates the requirements on [pyarrow](https://github.com/apache/arrow) to permit the latest version.
- [Commits](apache/arrow@go/v6.0.1...go/v15.0.0)

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

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requirements.txt

@@ -10,7 +10,7 @@ flask>=3.0.0,<4
 flask_restful>=0.3.9,<1
 flask_cors>=4.0.0,<5
 pandas>=1.1.5,<3
-pyarrow>=6.0.1,<15
+pyarrow>=6.0.1,<16
 autofaiss>=2.9.6,<3
 webdataset>=0.2,<0.3
 h5py>=3.1.0,<4