Bump multidict from 6.4.3 to 6.6.4

Bumps [multidict](https://github.com/aio-libs/multidict) from 6.4.3 to 6.6.4.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](aio-libs/multidict@v6.4.3...v6.6.4)

---
updated-dependencies:
- dependency-name: multidict
  dependency-version: 6.6.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements_api.txt

@@ -8,7 +8,7 @@ gunicorn==23.0.0
 jinja2>=2.11.2
 matplotlib==3.10.0
 motor==3.1.1
-multidict==6.4.3
+multidict==6.6.4
 numba==0.61.0
 numpy>=1.23.5, <2.0.0
 odmantic==0.9.2