chore(deps): bump hpack from 4.1.0 to 4.2.0 in /lockfiles/py39

[dependabot]

Bumps hpack from 4.1.0 to 4.2.0.

Changelog

Sourced from hpack's changelog.

4.2.0 (2026-06-22)

API Changes (Backward Incompatible)

• Support for Python 3.9 has been removed.
• Support for PyPy 3.9 has been removed.

API Changes (Backward Compatible)

• Support for Python 3.14 has been added.

Bugfixes

• Headers marked as sensitive will no longer log their value at DEBUG level. Instead a placeholder value of SENSITIVE_REDACTED is logged.
• Fixed perfect match missed for headers with empty values.
• Restricted variable integer decoding to uint32 to prevent run-away computation. With thanks to Hiroki Nishino_.

.. _Hiroki Nishino: https://github.com/tawAsh1

Commits

• d05cff4 v4.2.0
• 4bdecf4 packaging and dependencies++
• 8cfb02c Restricte variable integer decoding to uint32 to prevent run-away computation
• 77e36a9 linting
• 5258f14 rename test file to avoice pyc import confusion
• 44193d8 project cleanup
• e0497f9 Fix perfect match missed for headers with empty values: add test and changelog
• 89cce96 Fix perfect match missed for headers with empty values
• 1621490 Apply suggestion from @​Kriechi
• 517dd78 Apply suggestion from @​Kriechi
• Additional commits viewable in compare view

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[github-actions]

Not auto-merged: /lockfiles/py39 is frozen because Dependabot does not honour Requires-Python. Check whether hpack still supports that lockfile's interpreter. If it does, regenerate the lockfile with pip-compile on a matching Python host. Either way, close this PR afterwards.

[markuslf]

Closing: hpack 4.2.0 requires Python >= 3.10 (requires_python=">=3.10"), and lockfiles/py39 must stay installable on Python 3.9. 4.1.0 is the last hpack release for 3.9, so there is no patched version for this lockfile.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.