Update dependency charset-normalizer to v3.4.3 (#437)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[charset-normalizer](https://redirect.github.com/jawah/charset_normalizer)
([changelog](https://redirect.github.com/jawah/charset_normalizer/blob/master/CHANGELOG.md))
| `==3.4.2` -> `==3.4.3` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/charset-normalizer/3.4.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/charset-normalizer/3.4.2/3.4.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v3.4.3`](https://redirect.github.com/jawah/charset_normalizer/blob/HEAD/CHANGELOG.md#343-2025-08-09)

[Compare
Source](https://redirect.github.com/jawah/charset_normalizer/compare/3.4.2...3.4.3)

##### Changed

- mypy(c) is no longer a required dependency at build time if
`CHARSET_NORMALIZER_USE_MYPYC` isn't set to `1`.
([#&#8203;595](https://redirect.github.com/jawah/charset_normalizer/issues/595))
([#&#8203;583](https://redirect.github.com/jawah/charset_normalizer/issues/583))
- automatically lower confidence on small bytes samples that are not
Unicode in `detect` output legacy function.
([#&#8203;391](https://redirect.github.com/jawah/charset_normalizer/issues/391))

##### Added

- Custom build backend to overcome inability to mark mypy as an optional
dependency in the build phase.
- Support for Python 3.14

##### Fixed

- sdist archive contained useless directories.
- automatically fallback on valid UTF-16 or UTF-32 even if the md says
it's noisy.
([#&#8203;633](https://redirect.github.com/jawah/charset_normalizer/issues/633))

##### Misc

- SBOM are automatically published to the relevant GitHub release to
comply with regulatory changes.
Each published wheel comes with its SBOM. We choose CycloneDX as the
format.
- Prebuilt optimized wheel are no longer distributed by default for
CPython 3.7 due to a change in cibuildwheel.

</details>

---

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Author: lettuce-bot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 certifi==2025.8.3
 cffi==1.17.1
-charset-normalizer==3.4.2
+charset-normalizer==3.4.3
 click==8.2.1
 cryptography==45.0.6
 Deprecated==1.2.18