Sync python-rounding with the updated tutorial

[realpython-bot]

Companion to the maintenance update of How to Round Numbers in Python.

What changed

• Added requirements.txt pinning the tutorial's tested versions: numpy==2.5.3, pandas==3.0.6 (the article's dependencies field was bumped from numpy 2.1.3 / pandas 2.2.3 / Python 3.13 to numpy 2.5.3 / pandas 3.0.6 / Python 3.14).
• README: added a Requirements section stating the floor (Python 3.12 or later, from numpy 2.5.3's Requires-Python) and the install command.
• The code in rounding.py and rounding_numpy.py already matches the article; unchanged.

Links

• Draft (update clone) admin: https://realpython.com/pbjt/blog/post/2428/change/
• Maintenance card: https://trello.com/c/ZZpoiXzz

Verification

• Fresh venv on Python 3.14.6 with numpy==2.5.3, pandas==3.0.6: both scripts executed and every function exercised on floats, NumPy arrays, and a pandas Series with expected results.
• uvx ruff@0.14.1 format --check and uvx ruff@0.14.1 check on python-rounding: clean.

🤖 Generated with Claude Code