Update responses requirement from ~=0.17.0 to ~=0.21.0

Updates the requirements on [responses](https://github.com/getsentry/responses) to permit the latest version.
- [Release notes](https://github.com/getsentry/responses/releases)
- [Changelog](https://github.com/getsentry/responses/blob/master/CHANGES)
- [Commits](getsentry/responses@0.17.0...0.21.0)

---
updated-dependencies:
- dependency-name: responses
  dependency-type: direct:production
...

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

tests/requirements.txt

@@ -14,7 +14,7 @@ python-dateutil==2.8.2
 pytz==2022.1
 webpack-manifest==2.1.1
 # only for testing
-responses~=0.17.0
+responses~=0.21.0
 selenium==4.2.0
 tblib==1.7.0
 unittest-xml-reporting==3.2.0