Bump multidict from 6.0.5 to 6.7.0 (#2768)

Bumps [multidict](https://github.com/aio-libs/multidict) from 6.0.5 to 6.7.0.
- [Release notes](https://github.com/aio-libs/multidict/releases)
- [Changelog](https://github.com/aio-libs/multidict/blob/master/CHANGES.rst)
- [Commits](aio-libs/multidict@v6.0.5...v6.7.0)

---
updated-dependencies:
- dependency-name: multidict
  dependency-version: 6.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -203,7 +203,7 @@ msgraph-sdk==1.45.0
     # via -r requirements.in
 msrest==0.7.1
     # via azure-monitor-opentelemetry-exporter
-multidict==6.0.5
+multidict==6.7.0
     # via
     #   aiohttp
     #   yarl