chore(deps): update charset-normalizer requirement from >=3.4.7 to >=3.4.9 in /backend/python/vllm

[dependabot]

Updates the requirements on charset-normalizer to permit the latest version.

Release notes

Sourced from charset-normalizer's releases.

Version 3.4.9

3.4.9 (2026-07-07)

Fixed

• Regression in our fallback path leading to a decode error. (#771) We've yanked 3.4.8 as a result of that bug.

Changelog

Sourced from charset-normalizer's changelog.

3.4.9 (2026-07-07)

Fixed

• Regression in our fallback path leading to a decode error. (#771) We've yanked 3.4.8 as a result of that bug.

3.4.8 (2026-07-06)

Fixed

• Wall import time due to cascade codec imports for our multibyte first sort of iana supported codecs (#742)
• Unnecessary json import at runtime (#753)
• Inverse capitalization not seen by noise detector (#731)

Changed

• No longer holding a global cache for our noise / coherence measurements. Relax RSS memory usage.
• Micro-optimizations in our noise / coherence measurements.
• No longer using regex search by default for our preemptive charset mark algorithm.
• Raised upperbound of setuptools to v83.
• Raised upperbound of mypy(c) to v2.1.

Removed

• Redundant UTF7 BOM marker (#730)

3.4.7 (2026-04-02)

Changed

• Pre-built optimized version using mypy[c] v1.20.
• Relax setuptools constraint to setuptools>=68,<82.1.

Fixed

• Correctly remove SIG remnant in utf-7 decoded string. (#718) (#716)

3.4.6 (2026-03-15)

Changed

• Flattened the logic in charset_normalizer.md for higher performance. Removed eligible(..) and feed(...) in favor of feed_info(...).
• Raised upper bound for mypy[c] to 1.20, for our optimized version.
• Updated UNICODE_RANGES_COMBINED using Unicode blocks v17.

Fixed

• Edge case where noise difference between two candidates can be almost insignificant. (#672)
• CLI --normalize writing to wrong path when passing multiple files in. (#702)

Misc

• Freethreaded pre-built wheels now shipped in PyPI starting with 3.14t. (#616)

3.4.5 (2026-03-06)

Changed

... (truncated)

Commits

• cc68407 Merge pull request #772 from jawah/fix-regression-fallback-path
• 152b923 chore: release 3.4.9
• 2bc2607 fix: unicodedecodeerror in fallback path
• be252d7 chore(deps): bump docker/setup-qemu-action from 4.1.0 to 4.2.0 (#767)
• 71c7bdd chore(deps): bump actions/setup-python from 6.2.0 to 6.3.0 (#768)
• aeea391 chore(deps): bump pypa/cibuildwheel from 3.4.1 to 4.1.0 (#758)
• a6f8feb Merge pull request #770 from jawah/unblock-ci
• 528e16c chore: add osv-scanner.toml
• 5993498 chore: ast_serialize musl missing prebuilt riscv,s390x,ppc64le
• aa2ddd8 Release 3.4.8 (#766)
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