Bump polars from 0.18.15 to 0.19.1 (#626)

Bumps [polars](https://github.com/pola-rs/polars) from 0.18.15 to
0.19.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pola-rs/polars/commit/ad73217ab677a631ba4e71dbb9b88147cde9fbef"><code>ad73217</code></a>
python polars 0.19.1 (<a
href="https://redirect.github.com/pola-rs/polars/issues/10817">#10817</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/69e4826db605609d7f97191567b8969d97bb23b3"><code>69e4826</code></a>
fix: empty product returns identity (<a
href="https://redirect.github.com/pola-rs/polars/issues/10842">#10842</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/84c5c6027bdd97712381cbe65c665796ff620371"><code>84c5c60</code></a>
fix(rust, python): never panic in hash/equality doesn't hold in cse (<a
href="https://redirect.github.com/pola-rs/polars/issues/10836">#10836</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/062129d00491626c16b8c186ee25b2f2d89abf17"><code>062129d</code></a>
fix: Improve bound checks on temporal ranges (<a
href="https://redirect.github.com/pola-rs/polars/issues/10837">#10837</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/f71aef4c4efb90ca62562d34b56864b337da50e7"><code>f71aef4</code></a>
feat(python): add <code>binary</code>, <code>boolean</code>,
<code>categorical</code>, <code>date</code>, <code>object</code>, and
`...</li>
<li><a
href="https://github.com/pola-rs/polars/commit/fd26b3cc9a509064155e9ed448591a6c45f66be2"><code>fd26b3c</code></a>
refactor: Refactor <code>range</code> related functions (<a
href="https://redirect.github.com/pola-rs/polars/issues/10830">#10830</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/cff58c628a1ff15d25740b47b07eaebbe1244768"><code>cff58c6</code></a>
feat(rust, python): Supports is_last operation (<a
href="https://redirect.github.com/pola-rs/polars/issues/10760">#10760</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/c3070204cb8353b4a5d0a6c2ebf225f83f2eb61e"><code>c307020</code></a>
fix: var/std behavior around few elements (<a
href="https://redirect.github.com/pola-rs/polars/issues/10828">#10828</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/ebd3ff52f59ac30f1e0bf2f9bbed02a6087308eb"><code>ebd3ff5</code></a>
docs(python): map-related docstring updates (<a
href="https://redirect.github.com/pola-rs/polars/issues/10779">#10779</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/931de8f0ae8f4260e9d69b9db03a40d174853349"><code>931de8f</code></a>
fix(rust, python): divide by zero error when reading empty csv in
streaming m...</li>
<li>Additional commits viewable in <a
href="https://github.com/pola-rs/polars/compare/py-0.18.15...py-0.19.1">compare
view</a></li>
</ul>
</details>
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</details>

Author: matthias-wende-frequenz

pyproject.toml

@@ -56,7 +56,7 @@ dev-flake8 = [
   "pydoclint == 0.3.1",
   "pydocstyle == 6.3.0",
 ]
-dev-examples = ["polars == 0.18.15"]
+dev-examples = ["polars == 0.19.1"]
 dev-formatting = ["black == 23.7.0", "isort == 5.12.0"]
 dev-mkdocs = [
   "mike == 1.1.2",