Update dependency multidict to v6.7.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
multidict	==6.6.3 → ==6.7.1

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Release Notes

aio-libs/multidict (multidict)

v6.7.1

Compare Source

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(2026-01-25)

Bug fixes

• Fixed slow memory leak caused by identity by adding Py_DECREF to identity value before leaving md_pop_one on success
  -- by :user:Vizonex.

  Related issues and pull requests on GitHub:
  :issue:1284.

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v6.7.0

Compare Source

=====

(2025-10-05)

Contributor-facing changes

• Updated tests and added CI for CPython 3.14 -- by :user:kumaraditya303.

  Related issues and pull requests on GitHub:
  :issue:1235.

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v6.6.4

Compare Source

=====

(2025-08-11)

Bug fixes

• Fixed MutliDict & CIMultiDict memory leak when deleting values or clearing them
  -- by :user:Vizonex

  Related issues and pull requests on GitHub:
  :issue:1233.

Contributor-facing changes

• The type preciseness coverage report generated by MyPy <https://mypy-lang.org>__ is now uploaded to Coveralls <https://coveralls.io/github/aio-libs/multidict>__ and
  will not be included in the Codecov views <https://app.codecov.io/gh/aio-libs/multidict>__ going forward
  -- by :user:webknjaz.

  Related issues and pull requests on GitHub:
  :issue:1122, :issue:1231.

• Added memory leak test for popping or deleting attributes from a multidict to prevent future issues or bogus claims.
  -- by :user:Vizonex

  Related issues and pull requests on GitHub:
  :issue:1233.

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