Bump twine from 1.13.0 to 1.15.0

Bumps [twine](https://github.com/pypa/twine) from 1.13.0 to 1.15.0.
- [Release notes](https://github.com/pypa/twine/releases)
- [Changelog](https://github.com/pypa/twine/blob/master/docs/changelog.rst)
- [Commits](https://github.com/pypa/twine/compare/1.13.0...1.15.0)

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

requirements-dev.txt

@@ -5,4 +5,4 @@ pycodestyle==2.5.0
 pyflakes==1.6.0
 readme_renderer[md]==24.0
 requests_mock
-twine==1.13.0
+twine==1.15.0