chore(deps): update dependency urllib3 to v2.4.0 (#126)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [urllib3](https://github.com/urllib3/urllib3) ([changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)) | minor | `==2.3.0` -> `==2.4.0` |

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### Release Notes

<details>
<summary>urllib3/urllib3 (urllib3)</summary>

### [`v2.4.0`](https://github.com/urllib3/urllib3/blob/HEAD/CHANGES.rst#240-2025-04-10)

[Compare Source](https://github.com/urllib3/urllib3/compare/2.3.0...2.4.0)

\==================

## Features

-   Applied PEP 639 by specifying the license fields in pyproject.toml. (`#&#8203;3522 <https://github.com/urllib3/urllib3/issues/3522>`\__)
-   Updated exceptions to save and restore more properties during the pickle/serialization process. (`#&#8203;3567 <https://github.com/urllib3/urllib3/issues/3567>`\__)
-   Added `verify_flags` option to `create_urllib3_context` with a default of `VERIFY_X509_PARTIAL_CHAIN` and `VERIFY_X509_STRICT` for Python 3.13+. (`#&#8203;3571 <https://github.com/urllib3/urllib3/issues/3571>`\__)

## Bugfixes

-   Fixed a bug with partial reads of streaming data in Emscripten. (`#&#8203;3555 <https://github.com/urllib3/urllib3/issues/3555>`\__)

## Misc

-   Switched to uv for installing development dependecies. (`#&#8203;3550 <https://github.com/urllib3/urllib3/issues/3550>`\__)
-   Removed the `multiple.intoto.jsonl` asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (`#&#8203;3566 <https://github.com/urllib3/urllib3/issues/3566>`\__)

</details>

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Reviewed-on: https://git.tainton.uk/luke/epage/pulls/126
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requirements.txt

@@ -8,6 +8,6 @@ itsdangerous==2.2.0
 Jinja2==3.1.6
 MarkupSafe==3.0.2
 requests==2.32.3
-urllib3==2.3.0
+urllib3==2.4.0
 Werkzeug==3.1.3
 WTForms==3.2.1