Remove support for Python 3.9 (EOL)
Python 3.9 is EOL (2025-10), and is no longer supported by the latest versions of various dependencies (e.g. numpy, dask.).
Let's set the new minimum to Python 3.10.
This issues mirrors NCAS-CMS/cfdm#353
Remove support for Python 3.9 (EOL)
Python 3.9 is EOL (2025-10), and is no longer supported by the latest versions of various dependencies (e.g. numpy, dask.).
Let's set the new minimum to Python 3.10.
This issues mirrors NCAS-CMS/cfdm#353