Bump polars from 0.18.12 to 0.18.13 (#570)

Bumps [polars](https://github.com/pola-rs/polars) from 0.18.12 to
0.18.13.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pola-rs/polars/commit/9c194a24ad6aac33004c8fb0515a90239a376f44"><code>9c194a2</code></a>
feat(python): Add <code>categorical_as_str</code> parameter to testing
utils (<a
href="https://redirect.github.com/pola-rs/polars/issues/10350">#10350</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/1afa2f665d4826d05b773a2d4cd4731ecfa75e79"><code>1afa2f6</code></a>
python polars 0.18.13 (<a
href="https://redirect.github.com/pola-rs/polars/issues/10351">#10351</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/2f9822ed197df75386067a462dd3fc9135d54916"><code>2f9822e</code></a>
chore(rust): remove wasm-timer dependency (<a
href="https://redirect.github.com/pola-rs/polars/issues/10347">#10347</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/373b2c729e59ac831bf4f3b3fde0e434e06fe4be"><code>373b2c7</code></a>
perf(rust): re-use regex capture allocation (<a
href="https://redirect.github.com/pola-rs/polars/issues/10302">#10302</a>)
(<a
href="https://redirect.github.com/pola-rs/polars/issues/10335">#10335</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/f5ccb7e2f2de1a80e26a5e27a8315b7a558485d7"><code>f5ccb7e</code></a>
docs(rust): write down invariants of ChunkedArray (<a
href="https://redirect.github.com/pola-rs/polars/issues/10334">#10334</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/d246f1221c9ed9f9b3853ed8845da8ca866d44ff"><code>d246f12</code></a>
feat(python): support <code>selectors</code> in additional frame methods
(<a
href="https://redirect.github.com/pola-rs/polars/issues/10255">#10255</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/aea8015f2d053e98c1fdeec95249b6ff4e9549dd"><code>aea8015</code></a>
feat(rust!,python): Add <code>Series.cat.uses_lexical_ordering</code>
(<a
href="https://redirect.github.com/pola-rs/polars/issues/10325">#10325</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/598df75d6bfaf49f2683652279446c53d042998e"><code>598df75</code></a>
feat(python): utility to get buffers and pointers (<a
href="https://redirect.github.com/pola-rs/polars/issues/10331">#10331</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/fda5e268719015a555a42e2b1539fa0a9f9bd570"><code>fda5e26</code></a>
feat(rust, python): improve datetime parsing error message (<a
href="https://redirect.github.com/pola-rs/polars/issues/10332">#10332</a>)</li>
<li><a
href="https://github.com/pola-rs/polars/commit/dfa53b228ae5a0daef42dcaa6d25b511667f3844"><code>dfa53b2</code></a>
feat(python): add ptr for small integer types (<a
href="https://redirect.github.com/pola-rs/polars/issues/10330">#10330</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pola-rs/polars/compare/py-0.18.12...py-0.18.13">compare
view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=polars&package-manager=pip&previous-version=0.18.12&new-version=0.18.13)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)

</details>

Author: Marenz

pyproject.toml

@@ -54,7 +54,7 @@ dev-docstrings = [
   "darglint == 1.8.1",
   "tomli == 2.0.1",      # Needed by pydocstyle to read pyproject.toml
 ]
-dev-examples = ["polars == 0.18.12"]
+dev-examples = ["polars == 0.18.13"]
 dev-formatting = ["black == 23.7.0", "isort == 5.12.0"]
 dev-mkdocs = [
   "mike == 1.1.2",