Bump polars from 0.18.5 to 0.18.6 (#491)

Bumps [polars](https://github.com/pola-rs/polars) from 0.18.5 to 0.18.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pola-rs/polars/commit/71106c34681cd50d6e96cc5bb12376256a7b578e"><code>71106c3</code></a>
python polars 0.18.6 (<a
href="https://redirect.github.com/pola-rs/polars/issues/9746">#9746</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/d34b4317c3669486d97ad47409cf8a3ee3768273"><code>d34b431</code></a>
feat(rust, python): allow qcut in window expressions (<a
href="https://redirect.github.com/pola-rs/polars/issues/9745">#9745</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/d2c6549cdc36f1ea21dc88b6f9d42b7704a059d5"><code>d2c6549</code></a>
fix(rust, python): merge rev-maps when building list arrays of
categoricals. ...</li>
<li><a
href="https://github.com/pola-rs/polars/commit/2167cb1d881d8e07d395b3d1d1cb21c3d98d3276"><code>2167cb1</code></a>
fix(rust, python): Loosen restrictions on cut expressions and add docs
(<a
href="https://redirect.github.com/pola-rs/polars/issues/9730">#9730</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/a87751a3bfe6d44c79c734055d2abb9b70b0ca7d"><code>a87751a</code></a>
fix(rust, python): Fix list symmetric difference (<a
href="https://redirect.github.com/pola-rs/polars/issues/9732">#9732</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/da88c46d8220334987e4b4c1f6a0a492dd59f25d"><code>da88c46</code></a>
fix(rust, python): Fix list intersection (<a
href="https://redirect.github.com/pola-rs/polars/issues/9735">#9735</a>)</li>
<li>See full diff in <a
href="https://github.com/pola-rs/polars/compare/py-0.18.5...py-0.18.6">compare
view</a></li>
</ul>
</details>
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</details>

Author: daniel-zullo-frequenz

pyproject.toml

@@ -58,7 +58,7 @@ docs-lint = [
 ]
 format = ["black == 23.3.0", "isort == 5.12.0"]
 nox = ["nox == 2023.4.22", "toml == 0.10.2"]
-examples = [ "polars == 0.18.5" ]
+examples = [ "polars == 0.18.6" ]
 pytest = [
   "pytest == 7.4.0",
   "pytest-cov == 4.1.0",