chore(deps): update dependency charset-normalizer to v3.4.2 (#128)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [charset-normalizer](https://github.com/jawah/charset_normalizer) ([changelog](https://github.com/jawah/charset_normalizer/blob/master/CHANGELOG.md)) | patch | `==3.4.1` -> `==3.4.2` |

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### Release Notes

<details>
<summary>jawah/charset_normalizer (charset-normalizer)</summary>

### [`v3.4.2`](https://github.com/jawah/charset_normalizer/blob/HEAD/CHANGELOG.md#342-2025-05-02)

[Compare Source](https://github.com/jawah/charset_normalizer/compare/3.4.1...3.4.2)

##### Fixed

-   Addressed the DeprecationWarning in our CLI regarding `argparse.FileType` by backporting the target class into the package. ([#&#8203;591](https://github.com/jawah/charset_normalizer/issues/591))
-   Improved the overall reliability of the detector with CJK Ideographs. ([#&#8203;605](https://github.com/jawah/charset_normalizer/issues/605)) ([#&#8203;587](https://github.com/jawah/charset_normalizer/issues/587))

##### Changed

-   Optional mypyc compilation upgraded to version 1.15 for Python >= 3.8

</details>

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Reviewed-on: https://git.tainton.uk/luke/epage/pulls/128
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requirements.txt

@@ -1,5 +1,5 @@
 certifi==2025.4.26
-charset-normalizer==3.4.1
+charset-normalizer==3.4.2
 click==8.1.8
 Flask==3.1.0
 Flask-WTF==1.2.2