Fix missing project.version error for maturin >= 1.8

[lukeshingles]

Since Maturin 1.8, running make install for io_plugin or derive_expression results in:

⚠️  Warning: `project.version` field is required in pyproject.toml unless it is present in the `project.dynamic` list
💥 maturin failed
  Caused by: Cannot build without valid version information. You need to specify either `project.version` or `project.dynamic = ["version"]` in pyproject.toml.
make: *** [install] Error 1

See PyO3/maturin#2416

This fix sets project.dynamic = ["version"] in pyproject.toml, which the default for maturin init with recent versions.

CI failure should be fixed by #135 and dep update to polars 0.47.

[lukeshingles]

Superseded by #141