Upgrade: Update multidict requirement from >=6.6.4 to >=6.7.1

Updates the requirements on [multidict](https://github.com/aio-libs/multidict) to permit the latest version.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](aio-libs/multidict@v6.6.4...v6.7.1)

---
updated-dependencies:
- dependency-name: multidict
  dependency-version: 6.7.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -12,7 +12,7 @@ discord.py>=2.6.3
 filelock>=3.29.0
 frozenlist>=1.7.0
 idna>=3.10
-multidict>=6.6.4
+multidict>=6.7.1
 propcache>=0.3.2
 python-dotenv>=1.1.1
 python-magic>=0.4.14