Bump multidict from 6.5.0 to 6.6.0

Bumps [multidict](https://github.com/aio-libs/multidict) from 6.5.0 to 6.6.0.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](aio-libs/multidict@v6.5.0...v6.6.0)

---
updated-dependencies:
- dependency-name: multidict
  dependency-version: 6.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/test.txt

@@ -2,7 +2,7 @@
 covdefaults
 hypothesis>=6.0
 idna==3.10
-multidict==6.5.0
+multidict==6.6.2
 propcache==0.3.2
 pytest==8.4.1
 pytest-cov>=2.3.1