chore(deps): update pyarrow requirement from ^14 to >=14,<22

Updates the requirements on [pyarrow](https://github.com/apache/arrow) to permit the latest version.
- [Release notes](https://github.com/apache/arrow/releases)
- [Commits](apache/arrow@go/v14.0.0...apache-arrow-21.0.0)

---
updated-dependencies:
- dependency-name: pyarrow
  dependency-version: 21.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -31,7 +31,7 @@ typer = "^0.12.3"
 click = ">=8.1,<8.2"
 matplotlib = "~3.8"
 lifelines = "^0.30"
-pyarrow = "^14"
+pyarrow = ">=14,<22"
 pyreadr = "^0.5"
 
 [tool.poetry.group.dev.dependencies]