chore: bump polars from 1.39.3 to 1.40.0

Bumps [polars](https://github.com/pola-rs/polars) from 1.39.3 to 1.40.0.
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@py-1.39.3...py-1.40.0)

---
updated-dependencies:
- dependency-name: polars
  dependency-version: 1.40.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -41,7 +41,7 @@ darglint = "^1.8.1"
 mypy = "^1.20"
 myst-parser = "^4.0.1"
 nox = "^2025.11.12"
-polars = ">=0.16"
+polars = ">=1.40.0"
 pre-commit = "^4.5.0"
 pytest = ">8"
 # pytest-regtest compat https://gitlab.com/uweschmitt/pytest-regtest/-/merge_requests/9