Update responses requirement from ~=0.12.0 to ~=0.12.1 (#138)

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@0.12.0...0.12.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -1,6 +1,6 @@
 coveralls~=2.1.2
 doctr~=1.8.0
 pdoc3~=0.9.1
-responses~=0.12.0
+responses~=0.12.1
 tzlocal~=2.1
 iso8601~=0.1.13