[py] Update dependency charset-normalizer to v3.4.3

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This PR contains the following updates:

Package	Change	Age	Confidence
charset-normalizer (changelog)	==3.4.2 -> ==3.4.3

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Release Notes

jawah/charset_normalizer (charset-normalizer)

v3.4.3

Compare Source

Changed

• mypy(c) is no longer a required dependency at build time if CHARSET_NORMALIZER_USE_MYPYC isn't set to 1. (#​595) (#​583)
• automatically lower confidence on small bytes samples that are not Unicode in detect output legacy function. (#​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. (#​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.

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