Update responses requirement from ~=0.10.14 to ~=0.10.15 (#101)

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@0.10.14...0.10.15)

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

@@ -1,4 +1,4 @@
 coveralls~=2.0.0
 doctr~=1.8.0
 pdoc3~=0.8.1
-responses~=0.10.14
+responses~=0.10.15