Bump multidict from 6.4.2 to 6.4.3

Bumps [multidict](https://github.com/aio-libs/multidict) from 6.4.2 to 6.4.3.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](aio-libs/multidict@v6.4.2...v6.4.3)

---
updated-dependencies:
- dependency-name: multidict
  dependency-version: 6.4.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: requirements.txt

@@ -6,7 +6,7 @@ aioredis==2.0.1
 coverage==7.8.0
 docutils==0.21.2
 jinja2==3.1.6
-multidict==6.4.2
+multidict==6.4.3
 pygments==2.19.1
 pytest==8.3.5
 pytest-aiohttp==1.1.0