Update pyarrow requirement from <15,>=6.0.1 to >=6.0.1,<16

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
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -3,7 +3,7 @@ opencv-python-headless>=4.5.5.62,<5
 fire>=0.4.0,<0.6.0
 webdataset>=0.2.5,<0.3
 pandas>=1.1.5,<3
-pyarrow>=6.0.1,<15
+pyarrow>=6.0.1,<16
 exifread-nocycle>=3.0.1,<4
 albumentations>=1.1.0,<2
 dataclasses>=0.6,<1.0.0