Deprecated installation method being used

[felixdivo]

On an ubuntu:26.04 Docker image, I get the following warning:

DEPRECATION: Building 'filterpy' using the legacy setup.py bdist_wheel mechanism,
which will be removed in a future version. pip 25.3 will enforce this behaviour change.
A possible replacement is to use the standardized build interface by setting the
`--use-pep517` option, (possibly combined with `--no-build-isolation`), or adding a
`pyproject.toml` file to the source tree of 'filterpy'. Discussion can be found at
https://github.com/pypa/pip/issues/6334