Bump aioresponses from 0.7.4 to 0.7.6 in /server

Bumps [aioresponses](https://github.com/pnuckowski/aioresponses) from 0.7.4 to 0.7.6.
- [Release notes](https://github.com/pnuckowski/aioresponses/releases)
- [Commits](pnuckowski/aioresponses@0.7.4...0.7.6)

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

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

server/requirements.txt

@@ -48,5 +48,5 @@ pytest-django==4.5.2
 pytest-asyncio==0.23.3
 pytest-cov==4.1.0
 pytest-rerunfailures==13.0
-aioresponses==0.7.4
+aioresponses==0.7.6
 yappi==1.4.0