Update pyarrow requirement in /by-language/python-turbodbc

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@apache-arrow-0.1.0...apache-arrow-20.0.0)

---
updated-dependencies:
- dependency-name: pyarrow
  dependency-version: 20.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

by-language/python-turbodbc/requirements-prereq.txt

@@ -1,4 +1,4 @@
 # Turbodbc wants NumPy and PyArrow to be installed upfront.
 numpy>=2
-pyarrow<20
+pyarrow<21
 wheel